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

Remove obsolete DOMContentLoadedEventListener

See merge request gitlab-org/gitlab!56537

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

 import IntegrationSettingsForm from '~/integrations/integration_settings_form';
 
-document.addEventListener('DOMContentLoaded', () => {
-  const integrationSettingsForm = new IntegrationSettingsForm('.js-integration-settings-form');
-  integrationSettingsForm.init();
-});
+const integrationSettingsForm = new IntegrationSettingsForm('.js-integration-settings-form');
+integrationSettingsForm.init();