migrate projects:merge_requests:creations:new to static bundle

app/assets/javascripts/dispatcher.js

@@ -50,10 +50,6 @@ var Dispatcher;
         case 'projects:issues:edit':
           shortcut_handler = true;
           break;
-        case 'projects:merge_requests:creations:new':
-          import('./pages/projects/merge_requests/creations/new')
-            .then(callDefault)
-            .catch(fail);
         case 'projects:merge_requests:creations:diffs':
           import('./pages/projects/merge_requests/creations/diffs')
             .then(callDefault)

app/assets/javascripts/pages/projects/merge_requests/creations/new/index.js

 import Compare from '~/compare';
 import MergeRequest from '~/merge_request';
 
-export default () => {
+document.addEventListener('DOMContentLoaded', () => {
   const mrNewCompareNode = document.querySelector('.js-merge-request-new-compare');
   if (mrNewCompareNode) {
     new Compare({ // eslint-disable-line no-new
@@ -15,4 +15,4 @@ export default () => {
       action: mrNewSubmitNode.dataset.mrSubmitAction,
     });
   }
-};
+});