Remove DOMContentLoaded Eventlisteners

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

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

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

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

@@ -7,13 +7,11 @@ import UsersSelect from '~/users_select';
 import UserCallout from '~/user_callout';
 import groupsSelect from '~/groups_select';
 
-document.addEventListener('DOMContentLoaded', () => {
-  new UsersSelect();
-  groupsSelect();
+new UsersSelect();
+groupsSelect();
 
-  new UserCallout({ className: 'js-mr-approval-callout' });
+new UserCallout({ className: 'js-mr-approval-callout' });
 
-  mountApprovals(document.getElementById('js-mr-approvals-settings'));
+mountApprovals(document.getElementById('js-mr-approvals-settings'));
 
-  initProjectAdjournedDeleteButton();
-});
+initProjectAdjournedDeleteButton();

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

 import '~/pages/projects/jobs/show/index';
 import initVueAlerts from '~/vue_alerts';
 
-document.addEventListener('DOMContentLoaded', initVueAlerts);
+initVueAlerts();

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

@@ -2,7 +2,5 @@ import '~/pages/projects/milestones/show/index';
 import initBurndownChart from 'ee/burndown_chart';
 import UserCallout from '~/user_callout';
 
-document.addEventListener('DOMContentLoaded', () => {
-  new UserCallout(); // eslint-disable-line no-new
-  initBurndownChart();
-});
+new UserCallout(); // eslint-disable-line no-new
+initBurndownChart();

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

 import '~/pages/projects/new/index';
 import initCustomProjectTemplates from 'ee/projects/custom_project_templates';
 
-document.addEventListener('DOMContentLoaded', () => {
-  initCustomProjectTemplates();
-});
+initCustomProjectTemplates();

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

 import initOnDemanScans from 'ee/on_demand_scans';
 
-document.addEventListener('DOMContentLoaded', initOnDemanScans);
+initOnDemanScans();