DEV: Automatically update groups for test users with explicit TL (#25415)

For performance reasons we don't automatically add fabricated users to trust level auto-groups. However, when explicitly passing a trust level to the fabricator, in 99% of cases it means that trust level is relevant for the test, and we need the groups.

This change makes it so that when a trust level is explicitly passed to the fabricator, the auto-groups are refreshed. There's no longer a need to also pass refresh_auto_groups: true, which means clearer tests, fewer mistakes, and less confusion.

spec/lib/topic_creator_spec.rb

@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 RSpec.describe TopicCreator do
-  fab!(:user) { Fabricate(:user, trust_level: TrustLevel[2], refresh_auto_groups: true) }
+  fab!(:user) { Fabricate(:user, trust_level: TrustLevel[2]) }
   fab!(:moderator)
   fab!(:admin) { Fabricate(:admin, refresh_auto_groups: true) }