FIX: Dismiss new with better migration (#12062)

Original PR was reverted because of broken migration https://github.com/discourse/discourse/pull/12058

I fixed it by adding this line
```
          AND topics.id IN(SELECT id FROM topics ORDER BY created_at DESC LIMIT :max_new_topics)
```

This time it is left joining a limited amount of topics. I tested it on few databases and it worked quite smooth

spec/jobs/export_user_archive_spec.rb

@@ -317,7 +317,6 @@ describe Jobs::ExportUserArchive do
           .where(category_id: category_id)
           .first_or_initialize
           .update!(last_seen_at: reset_at)
-        #TopicTrackingState.publish_dismiss_new(user.id, category_id)
       end
 
       # Set Watching First Post on announcements, Tracking on subcategory, Muted on deleted, nothing on subsubcategory