Reverts discourse/discourse-chat-integration#191
This is causing Discourse Core CI to fail, so reverting for now.
```
64: from bin/rake:13:in `<main>'
63: from /__w/discourse/discourse/vendor/bundle/ruby/3.2.0/gems/rake-13.1.0/lib/rake/application.rb:80:in `run'
62: from /__w/discourse/discourse/vendor/bundle/ruby/3.2.0/gems/rake-13.1.0/lib/rake/application.rb:208:in `standard_exception_handling'
61: from /__w/discourse/discourse/vendor/bundle/ruby/3.2.0/gems/rake-13.1.0/lib/rake/application.rb:83:in `block in run'
60: from /__w/discourse/discourse/vendor/bundle/ruby/3.2.0/gems/rake-13.1.0/lib/rake/application.rb:132:in `top_level'
59: from /__w/discourse/discourse/vendor/bundle/ruby/3.2.0/gems/rake-13.1.0/lib/rake/application.rb:147:in `run_with_threads'
58: from /__w/discourse/discourse/vendor/bundle/ruby/3.2.0/gems/rake-13.1.0/lib/rake/application.rb:138:in `block in top_level'
57: from /__w/discourse/discourse/vendor/bundle/ruby/3.2.0/gems/rake-13.1.0/lib/rake/application.rb:138:in `each'
56: from /__w/discourse/discourse/vendor/bundle/ruby/3.2.0/gems/rake-13.1.0/lib/rake/application.rb:138:in `block (2 levels) in top_level'
55: from /__w/discourse/discourse/vendor/bundle/ruby/3.2.0/gems/rake-13.1.0/lib/rake/application.rb:182:in `invoke_task'
54: from /__w/discourse/discourse/vendor/bundle/ruby/3.2.0/gems/rake-13.1.0/lib/rake/task.rb:188:in `invoke'
53: from /__w/discourse/discourse/vendor/bundle/ruby/3.2.0/gems/rake-13.1.0/lib/rake/task.rb:199:in `invoke_with_call_chain'
52: from /__w/discourse/discourse/vendor/bundle/ruby/3.2.0/gems/rake-13.1.0/lib/rake/task.rb:199:in `synchronize'
51: from /__w/discourse/discourse/vendor/bundle/ruby/3.2.0/gems/rake-13.1.0/lib/rake/task.rb:218:in `block in invoke_with_call_chain'
50: from /__w/discourse/discourse/vendor/bundle/ruby/3.2.0/gems/rake-13.1.0/lib/rake/task.rb:241:in `invoke_prerequisites'
49: from /__w/discourse/discourse/vendor/bundle/ruby/3.2.0/gems/rake-13.1.0/lib/rake/task.rb:241:in `each'
48: from /__w/discourse/discourse/vendor/bundle/ruby/3.2.0/gems/rake-13.1.0/lib/rake/task.rb:243:in `block in invoke_prerequisites'
47: from /__w/discourse/discourse/vendor/bundle/ruby/3.2.0/gems/rake-13.1.0/lib/rake/task.rb:199:in `invoke_with_call_chain'
46: from /__w/discourse/discourse/vendor/bundle/ruby/3.2.0/gems/rake-13.1.0/lib/rake/task.rb:199:in `synchronize'
45: from /__w/discourse/discourse/vendor/bundle/ruby/3.2.0/gems/rake-13.1.0/lib/rake/task.rb:218:in `block in invoke_with_call_chain'
44: from /__w/discourse/discourse/vendor/bundle/ruby/3.2.0/gems/rake-13.1.0/lib/rake/task.rb:241:in `invoke_prerequisites'
43: from /__w/discourse/discourse/vendor/bundle/ruby/3.2.0/gems/rake-13.1.0/lib/rake/task.rb:241:in `each'
42: from /__w/discourse/discourse/vendor/bundle/ruby/3.2.0/gems/rake-13.1.0/lib/rake/task.rb:243:in `block in invoke_prerequisites'
41: from /__w/discourse/discourse/vendor/bundle/ruby/3.2.0/gems/rake-13.1.0/lib/rake/task.rb:199:in `invoke_with_call_chain'
40: from /__w/discourse/discourse/vendor/bundle/ruby/3.2.0/gems/rake-13.1.0/lib/rake/task.rb:199:in `synchronize'
39: from /__w/discourse/discourse/vendor/bundle/ruby/3.2.0/gems/rake-13.1.0/lib/rake/task.rb:219:in `block in invoke_with_call_chain'
38: from /__w/discourse/discourse/vendor/bundle/ruby/3.2.0/gems/rake-13.1.0/lib/rake/task.rb:281:in `execute'
37: from /__w/discourse/discourse/vendor/bundle/ruby/3.2.0/gems/rake-13.1.0/lib/rake/task.rb:281:in `each'
36: from /__w/discourse/discourse/vendor/bundle/ruby/3.2.0/gems/rake-13.1.0/lib/rake/task.rb:281:in `block in execute'
35: from /__w/discourse/discourse/vendor/bundle/ruby/3.2.0/gems/railties-7.0.8.1/lib/rails/application.rb:506:in `block in run_tasks_blocks'
34: from /__w/discourse/discourse/vendor/bundle/ruby/3.2.0/gems/railties-7.0.8.1/lib/rails/application.rb:348:in `require_environment!'
33: from /__w/discourse/discourse/vendor/bundle/ruby/3.2.0/gems/zeitwerk-2.6.13/lib/zeitwerk/kernel.rb:34:in `require'
32: from /__w/discourse/discourse/vendor/bundle/ruby/3.2.0/gems/bootsnap-1.18.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:30:in `require'
31: from <internal:/usr/local/lib/ruby/site_ruby/3.2.0/rubygems/core_ext/kernel_require.rb>:37:in `require'
30: from <internal:/usr/local/lib/ruby/site_ruby/3.2.0/rubygems/core_ext/kernel_require.rb>:37:in `require'
29: from /__w/discourse/discourse/config/environment.rb:7:in `<main>'
28: from /__w/discourse/discourse/vendor/bundle/ruby/3.2.0/gems/railties-7.0.8.1/lib/rails/application.rb:372:in `initialize!'
27: from /__w/discourse/discourse/vendor/bundle/ruby/3.2.0/gems/railties-7.0.8.1/lib/rails/initializable.rb:60:in `run_initializers'
26: from /usr/local/lib/ruby/3.2.0/tsort.rb:205:in `tsort_each'
25: from /usr/local/lib/ruby/3.2.0/tsort.rb:226:in `tsort_each'
24: from /usr/local/lib/ruby/3.2.0/tsort.rb:347:in `each_strongly_connected_component'
23: from /usr/local/lib/ruby/3.2.0/tsort.rb:347:in `call'
22: from /usr/local/lib/ruby/3.2.0/tsort.rb:347:in `each'
21: from /usr/local/lib/ruby/3.2.0/tsort.rb:349:in `block in each_strongly_connected_component'
20: from /usr/local/lib/ruby/3.2.0/tsort.rb:431:in `each_strongly_connected_component_from'
19: from /usr/local/lib/ruby/3.2.0/tsort.rb:350:in `block (2 levels) in each_strongly_connected_component'
18: from /usr/local/lib/ruby/3.2.0/tsort.rb:228:in `block in tsort_each'
17: from /__w/discourse/discourse/vendor/bundle/ruby/3.2.0/gems/railties-7.0.8.1/lib/rails/initializable.rb:61:in `block in run_initializers'
16: from /__w/discourse/discourse/vendor/bundle/ruby/3.2.0/gems/railties-7.0.8.1/lib/rails/initializable.rb:32:in `run'
15: from /__w/discourse/discourse/vendor/bundle/ruby/3.2.0/gems/railties-7.0.8.1/lib/rails/initializable.rb:32:in `instance_exec'
14: from /__w/discourse/discourse/vendor/bundle/ruby/3.2.0/gems/railties-7.0.8.1/lib/rails/application/finisher.rb:87:in `block in <module:Finisher>'
13: from /__w/discourse/discourse/vendor/bundle/ruby/3.2.0/gems/activesupport-7.0.8.1/lib/active_support/lazy_load_hooks.rb:75:in `run_load_hooks'
12: from /__w/discourse/discourse/vendor/bundle/ruby/3.2.0/gems/activesupport-7.0.8.1/lib/active_support/lazy_load_hooks.rb:75:in `each'
11: from /__w/discourse/discourse/vendor/bundle/ruby/3.2.0/gems/activesupport-7.0.8.1/lib/active_support/lazy_load_hooks.rb:76:in `block in run_load_hooks'
10: from /__w/discourse/discourse/vendor/bundle/ruby/3.2.0/gems/activesupport-7.0.8.1/lib/active_support/lazy_load_hooks.rb:90:in `execute_hook'
9: from /__w/discourse/discourse/vendor/bundle/ruby/3.2.0/gems/activesupport-7.0.8.1/lib/active_support/lazy_load_hooks.rb:85:in `with_execution_control'
8: from /__w/discourse/discourse/vendor/bundle/ruby/3.2.0/gems/activesupport-7.0.8.1/lib/active_support/lazy_load_hooks.rb:92:in `block in execute_hook'
7: from /__w/discourse/discourse/config/application.rb:239:in `block in <class:Application>'
6: from /__w/discourse/discourse/lib/plugin.rb:6:in `initialization_guard'
5: from /__w/discourse/discourse/config/application.rb:239:in `block (2 levels) in <class:Application>'
4: from /__w/discourse/discourse/config/application.rb:239:in `each'
3: from /__w/discourse/discourse/lib/plugin/instance.rb:555:in `notify_after_initialize'
2: from /__w/discourse/discourse/lib/plugin/instance.rb:555:in `each'
1: from /__w/discourse/discourse/lib/plugin/instance.rb:557:in `block in notify_after_initialize'
/__w/discourse/discourse/plugins/discourse-chat-integration/plugin.rb:25:in `block in activate!': undefined method `register_problem_check' for #<Plugin::Instance:0x00007f1a7c7491e8 @metadata=#<Plugin::Metadata:0x00007f1a80b4de98 @name="discourse-chat-integration", @about="Allows integration with several external chat system providers", @meta_topic_id=66522, @version="0.1", @url="https://github.com/discourse/discourse-chat-integration">, @path="/__w/discourse/discourse/plugins/discourse-chat-integration/plugin.rb", @idx=0, @enabled_site_setting=:chat_integration_enabled, @assets=[["/__w/discourse/discourse/plugins/discourse-chat-integration/assets/stylesheets/chat-integration.scss", nil, "discourse-chat-integration"]], @directory_name="discourse-chat-integration", @initializers=[#<Proc:0x00007f1a7aea3058 /__w/discourse/discourse/plugins/discourse-chat-integration/plugin.rb:20>], @styles=[], @javascripts=[], @locales=[], @service_workers=[], @seed_data={}, @extra_js_file_path="/__w/discourse/discourse/app/assets/javascripts/plugins/discourse-chat-integration_extra.js", @asset_filters=[], @color_schemes=[]> (NoMethodError)
** INCOMPATIBLE PLUGIN **
You are unable to start Discourse due to errors in the plugin at
/__w/discourse/discourse/plugins/discourse-chat-integration
```
We're promoting problem checks to first class citizens in core. This migrates the problem check to the new API.
In the process of adding tests for this check, I discovered what seems like a mistake that likely means this check never worked until now. (See inline comment.)
We're updating core to change TL based access settings to be group based. This requires some updates of tests to work correctly. (The existing test setup gives false positives.)
Previously we were using the `ts` of the previous message we sent to the thread. While this did work under some situations, it's not recommended in the Slack API docs, and can lead to some unexpected behavior (e.g. when one of the threaded messages is deleted).
This commit updates our logic to always use Slack's returned `thread_ts`, which represents the thread's parent.