Remove obsolete EventListeners

app/assets/javascripts/pages/ldap/omniauth_callbacks/index.js

 import { mount2faAuthentication } from '~/authentication/mount_2fa';
 
-document.addEventListener('DOMContentLoaded', mount2faAuthentication);
+mount2faAuthentication();

app/assets/javascripts/pages/projects/environments/folder/index.js

 import initEnvironmentsFolderBundle from '~/environments/folder/environments_folder_bundle';
 
-document.addEventListener('DOMContentLoaded', initEnvironmentsFolderBundle);
+initEnvironmentsFolderBundle();

app/assets/javascripts/pages/projects/environments/metrics/index.js

 import monitoringApp from '~/monitoring/monitoring_app';
 
-document.addEventListener('DOMContentLoaded', monitoringApp);
+monitoringApp();

app/assets/javascripts/pages/projects/environments/terminal/index.js

 import initTerminal from '~/terminal/';
 
-document.addEventListener('DOMContentLoaded', initTerminal);
+initTerminal();

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

@@ -2,7 +2,7 @@ import $ from 'jquery';
 import ShortcutsNetwork from '~/behaviors/shortcuts/shortcuts_network';
 import Network from '../network';
 
-document.addEventListener('DOMContentLoaded', () => {
+(() => {
   if (!$('.network-graph').length) return;
 
   const networkGraph = new Network({
@@ -14,4 +14,4 @@ document.addEventListener('DOMContentLoaded', () => {
 
   // eslint-disable-next-line no-new
   new ShortcutsNetwork(networkGraph.branch_graph);
-});
+})();

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

 import initStaticSiteEditor from '~/static_site_editor';
 
-window.addEventListener('DOMContentLoaded', () => {
-  initStaticSiteEditor(document.querySelector('#static-site-editor'));
-});
+initStaticSiteEditor(document.querySelector('#static-site-editor'));

app/assets/javascripts/sourcegraph/load.js

 import initSourcegraph from './index';
 
-/**
- * Load sourcegraph in it's own listener so that it's isolated from failures.
- */
-document.addEventListener('DOMContentLoaded', initSourcegraph);
+initSourcegraph();