Merge branch 'jnnk-remove-eventlistener-label-edit' into 'master'

Remove obsolete DOMContentLoadedEventListener

See merge request gitlab-org/gitlab!54912

app/assets/javascripts/pages/projects/labels/edit/index.js

 import Labels from 'ee_else_ce/labels';
 
-document.addEventListener('DOMContentLoaded', () => new Labels());
+new Labels(); // eslint-disable-line no-new