This refactor makes for easier testing and makes things
more organised, the guardian extensions had no testing
whatsoever and I need some to make the TL -> group change.
In https://github.com/discourse/discourse/pull/24740, `min_trust_to_create_topic` site setting was replaced by `create_topic_allowed_groups`. This PR replaces the former, deprecated one, with the latter.
See https://github.com/discourse/discourse/pull/18437,
we are removing any references to enable_personal_messages
in core and using only personal_message_enabled_groups,
which requires auto groups to be assigned in certain specs
for them to keep working.
Martin Brennan
Krzysztof Kotlarek
David Taylor
Joffrey JAFFEUX