Merge branch 'jnnkl-remove-eventlistener-admin-label-edit' into 'master'

Remove obsolete DOMContentLoadedEventListener

See merge request gitlab-org/gitlab!56666

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

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