refactor: migrate account-menu to react - implement functionality

- remove all Angular code related to `account-menu`
- rename React component to AccountMenu so that many parts of old code remain unchanged
- code cleanup

app/assets/javascripts/views/editor_group/editor_group_view.ts

@@ -15,7 +15,7 @@ class EditorGroupViewCtrl extends PureViewCtrl<unknown, {
     super($timeout);
     this.state = {
       showMultipleSelectedNotes: false
-    }
+    };
   }
 
   $onInit() {