refactor merge conflicts bundle to reduce side effects

app/assets/javascripts/merge_conflicts/merge_conflicts_bundle.js

@@ -12,7 +12,7 @@ import './components/inline_conflict_lines';
 import './components/parallel_conflict_lines';
 import syntaxHighlight from '../syntax_highlight';
 
-$(() => {
+export default function initMergeConflicts() {
   const INTERACTIVE_RESOLVE_MODE = 'interactive';
   const conflictsEl = document.querySelector('#conflicts');
   const mergeConflictsStore = gl.mergeConflicts.mergeConflictsStore;
@@ -91,4 +91,4 @@ $(() => {
       }
     }
   });
-});
+}

app/assets/javascripts/pages/projects/merge_requests/conflicts/index.js

 import initSidebarBundle from '~/sidebar/sidebar_bundle';
-import '~/merge_conflicts/merge_conflicts_bundle';
+import initMergeConflicts from '~/merge_conflicts/merge_conflicts_bundle';
 
-document.addEventListener('DOMContentLoaded', initSidebarBundle);
+document.addEventListener('DOMContentLoaded', () => {
+  initSidebarBundle();
+  initMergeConflicts();
+});