Merge branch 'jnnkl-project-import-eventlistener' into 'master'

Remove obsolete DOMContentLoadedEventListener

See merge request gitlab-org/gitlab!54916

app/assets/javascripts/pages/projects/imports/show/index.js

 import ProjectImport from '~/project_import';
 
-document.addEventListener('DOMContentLoaded', () => {
-  new ProjectImport(); // eslint-disable-line no-new
-});
+new ProjectImport(); // eslint-disable-line no-new