DEV: Convert min_trust_level_to_tag_topics to groups (#25258)

We're changing the implementation of trust levels to use groups. Part of this is to have site settings that reference trust levels use groups instead. It converts the min_trust_level_to_tag_topics site setting to tag_topic_allowed_groups.

spec/lib/search_spec.rb

@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 RSpec.describe Search do
-  fab!(:admin)
+  fab!(:admin) { Fabricate(:admin, refresh_auto_groups: true) }
   fab!(:topic)
 
   before do
@@ -1378,7 +1378,7 @@ RSpec.describe Search do
         SiteSetting.tagging_enabled = true
         DiscourseTagging.tag_topic_by_names(
           post.topic,
-          Guardian.new(Fabricate.build(:admin)),
+          Guardian.new(Fabricate(:admin, refresh_auto_groups: true)),
           [tag.name, uppercase_tag.name],
         )
         post.topic.save