Fix IssuesController#show degradation including project on loaded notes

CHANGELOG

@@ -10,6 +10,7 @@ v 8.12.2 (unreleased)
   - Fix Import/Export not recognising correctly the imported services.
   - Fix snippets pagination
   - Fix List-Unsubscribe header in emails
+  - Fix IssuesController#show degradation including project on loaded notes
   - Fix an issue with the "Commits" section of the cycle analytics summary. !6513
   - Fix errors importing project feature and milestone models using GitLab project import
 

app/controllers/projects/issues_controller.rb

@@ -54,7 +54,7 @@ class Projects::IssuesController < Projects::ApplicationController
   end
 
   def show
-    raw_notes = @issue.notes_with_associations.fresh
+    raw_notes = @issue.notes.inc_relations_for_view.fresh
 
     @notes = Banzai::NoteRenderer.
       render(raw_notes, @project, current_user, @path, @project_wiki, @ref)