Merge branch 'ntepluhina-add-ff-guard' into 'master'

Added 404 route guard for work items

See merge request gitlab-org/gitlab!69978

app/controllers/projects/work_items_controller.rb

@@ -8,5 +8,6 @@ class Projects::WorkItemsController < Projects::ApplicationController
   feature_category :not_owned
 
   def index
+    render_404 unless Feature.enabled?(:work_items, project, default_enabled: :yaml)
   end
 end