DEV: Colocate core components with mobile templates

Core now has support for mobile-specific overrides of component templates, so we can now safely colocate the last batch of core components.

Followup to 524cb5211b

spec/integrity/coding_style_spec.rb

@@ -48,7 +48,7 @@ RSpec.describe "Coding style" do
 
   describe "non-colocated component templates" do
     {
-      # "discourse" => "app/assets/javascripts/discourse/app/templates/components",
+      "discourse" => "app/assets/javascripts/discourse/app/templates/components",
       "admin" => "app/assets/javascripts/admin/addon/templates/components",
       "chat/discourse" => "plugins/chat/assets/javascripts/discourse/templates/components",
       "chat/admin" => "plugins/chat/assets/javascripts/admin/templates/components",