Merge branch '48093-fix-flakey-notes-background-process-specs' into 'master'

Fix flakey time-sensitive notes creation specs that rely on background Sidekiq jobs

Closes #48093

See merge request gitlab-org/gitlab-ce!19979

spec/support/helpers/features/notes_helpers.rb

@@ -13,7 +13,7 @@ module Spec
       module Features
         module NotesHelpers
           def add_note(text)
-            Sidekiq::Testing.fake! do
+            perform_enqueued_jobs do
               page.within(".js-main-target-form") do
                 fill_in("note[note]", with: text)
                 find(".js-comment-submit-button").click