DEV: Remove full group refreshes from tests (#25414)

We have all these calls to Group.refresh_automatic_groups! littered throughout the tests. Including tests that are seemingly unrelated to groups. This is because automatic group memberships aren't fabricated when making a vanilla user. There are two places where you'd want to use this:

You have fabricated a user that needs a certain trust level (which is now based on group membership.)
You need the system user to have a certain trust level.
In the first case, we can pass refresh_auto_groups: true to the fabricator instead. This is a more lightweight operation that only considers a single user, instead of all users in all groups.

The second case is no longer a thing after #25400.

spec/integration/watched_words_spec.rb

@@ -187,7 +187,6 @@ RSpec.describe WatchedWord do
     end
 
     it "doesn't need approval in a private message" do
-      Group.refresh_automatic_groups!
       manager =
         NewPostManager.new(
           tl2_user,