DEV: Convert min_trust_to_create_topic to groups (#24740)

This change converts the min_trust_to_create_topic site setting to
create_topic_allowed_groups.

See: https://meta.discourse.org/t/283408

- Hides the old setting
- Adds the new site setting
- Add a deprecation warning
- Updates to use the new setting
- Adds a migration to fill in the new setting if the old setting was
changed
- Adds an entry to the site_setting.keywords section
- Updates tests to account for the new change
- After a couple of months, we will remove the min_trust_to_create_topicsetting entirely.

Internal ref: /t/117248

spec/serializers/user_summary_serializer_spec.rb

@@ -3,8 +3,8 @@
 RSpec.describe UserSummarySerializer do
   it "returns expected data" do
     UserActionManager.enable
-    user = Fabricate(:user)
-    liked_user = Fabricate(:user, name: "John Doe", username: "john_doe")
+    user = Fabricate(:user, refresh_auto_groups: true)
+    liked_user = Fabricate(:user, name: "John Doe", username: "john_doe", refresh_auto_groups: true)
     liked_post = create_post(user: liked_user)
     PostActionCreator.like(user, liked_post)