Merge branch 'sh-optimize-label-finder' into 'master'

Reduce overhead of LabelFinder by avoiding #presence call

Some users experienced 502 timeouts when viewing group labels.
Labels#open_issues_count and Label#open_merge_requests_count were
taking a long time to load because they were loading every ActiveRecord
of the user-accessible projects into memory. This change modifies so
that only the IDs are loaded into memory.

Closes #23684

See merge request !7094

CHANGELOG.md

@@ -22,6 +22,7 @@ Please view this file on the master branch, on stable branches it's out of date.
   - Fix reply-by-email not working due to queue name mismatch
   - Fixed hidden pipeline graph on commit and MR page !6895
   - Expire and build repository cache after project import
+  - Reduce overhead of LabelFinder by avoiding #presence call !7094
   - Fix 404 for group pages when GitLab setup uses relative url
   - Simpler arguments passed to named_route on toggle_award_url helper method
   - Fix unauthorized users dragging on issue boards

app/finders/labels_finder.rb

@@ -50,7 +50,7 @@ class LabelsFinder < UnionFinder
   end
 
   def projects_ids
-    params[:project_ids].presence
+    params[:project_ids]
   end
 
   def title