Remove DOMContentLoaded Eventlisteners

Removing DOMContentLoaded Eventlisteners from
index files since the scripts
are embedded using the defer tag.

ee/app/assets/javascripts/pages/projects/blob/show/index.js

 import '~/pages/projects/blob/show/index';
 import initBlob from '../../shared/init_blob';
 
-document.addEventListener('DOMContentLoaded', initBlob);
+initBlob();

ee/app/assets/javascripts/pages/projects/iterations/index.js

 import { initIterationsList } from 'ee/iterations';
 import { Namespace } from 'ee/iterations/constants';
 
-document.addEventListener('DOMContentLoaded', () => initIterationsList(Namespace.Project));
+initIterationsList(Namespace.Project);

ee/app/assets/javascripts/pages/projects/iterations/inherited/show/index.js

 import { initIterationReport } from 'ee/iterations';
 import { Namespace } from 'ee/iterations/constants';
 
-document.addEventListener('DOMContentLoaded', () => {
-  initIterationReport({ namespaceType: Namespace.Project });
-});
+initIterationReport({ namespaceType: Namespace.Project });

ee/app/assets/javascripts/pages/projects/threat_monitoring/edit/index.js

 import initPolicyEditorApp from 'ee/threat_monitoring/policy_editor';
 
-document.addEventListener('DOMContentLoaded', initPolicyEditorApp);
+initPolicyEditorApp();

ee/app/assets/javascripts/pages/projects/threat_monitoring/new/index.js

 import initPolicyEditorApp from 'ee/threat_monitoring/policy_editor';
 
-document.addEventListener('DOMContentLoaded', initPolicyEditorApp);
+initPolicyEditorApp();

ee/app/assets/javascripts/pages/projects/threat_monitoring/show/index.js

 import initThreatMonitoringApp from 'ee/threat_monitoring';
 
-document.addEventListener('DOMContentLoaded', initThreatMonitoringApp);
+initThreatMonitoringApp();