FIX: Better tracking of topic visibility changes (#26709)

This commit introduces a few changes as a result of
customer issues with finding why a topic was relisted.
In one case, if a user edited the OP of a topic that was
unlisted and hidden because of too many flags, the topic
would get relisted by directly changing topic.visible,
instead of going via TopicStatusUpdater.

To improve tracking we:

* Introduce a visibility_reason_id to topic which functions
  in a similar way to hidden_reason_id on post, this column is
  set from the various places we change topic visibility
* Fix Post#unhide! which was directly modifying topic.visible,
  instead we use TopicStatusUpdater which sets visibility_reason_id
  and also makes a small action post
* Show the reason topic visibility changed when hovering the
  unlisted icon in topic status on topic titles

lib/post_action_creator.rb

@@ -235,7 +235,14 @@ class PostActionCreator
     return if not_auto_action_flag_type && !@queue_for_review
 
     if @queue_for_review
-      @post.topic.update_status("visible", false, @created_by) if @post.is_first_post?
+      if @post.is_first_post?
+        @post.topic.update_status(
+          "visible",
+          false,
+          @created_by,
+          { visibility_reason_id: Topic.visibility_reasons[:op_flag_threshold_reached] },
+        )
+      end
 
       @post.hide!(
         @post_action_type_id,