Merge branch 'jnnkl-remove-eventlistener-group-activ' into 'master'

Remove obsolete DOMContentLoadedEventListener

See merge request gitlab-org/gitlab!55054

app/assets/javascripts/pages/groups/activity/index.js

 import Activities from '~/activities';
 
-document.addEventListener('DOMContentLoaded', () => new Activities());
+// eslint-disable-next-line no-new
+new Activities();