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/lib/topic_query/private_message_lists_spec.rb

@@ -2,13 +2,11 @@
 
 RSpec.describe TopicQuery::PrivateMessageLists do
   fab!(:admin)
-  fab!(:user)
+  fab!(:user) { Fabricate(:user, refresh_auto_groups: true) }
   fab!(:user_2) { Fabricate(:user) }
   fab!(:user_3) { Fabricate(:user) }
   fab!(:user_4) { Fabricate(:user) }
 
-  before_all { Group.refresh_automatic_groups! }
-
   fab!(:group) do
     Fabricate(:group, messageable_level: Group::ALIAS_LEVELS[:everyone]).tap { |g| g.add(user_2) }
   end
@@ -163,11 +161,9 @@ RSpec.describe TopicQuery::PrivateMessageLists do
   end
 
   describe "#list_private_messages_unread" do
-    fab!(:user)
+    fab!(:user) { Fabricate(:user, refresh_auto_groups: true) }
     fab!(:user_2) { Fabricate(:user) }
 
-    before_all { Group.refresh_automatic_groups! }
-
     fab!(:pm) do
       create_post(
         user: user,
@@ -207,11 +203,9 @@ RSpec.describe TopicQuery::PrivateMessageLists do
   end
 
   describe "#list_private_messages_new" do
-    fab!(:user)
+    fab!(:user) { Fabricate(:user, refresh_auto_groups: true) }
     fab!(:user_2) { Fabricate(:user) }
 
-    before_all { Group.refresh_automatic_groups! }
-
     fab!(:pm) do
       create_post(
         user: user,