Move EE differences for `app/assets/javascripts/mr_notes/stores/index.js `

The file app/assets/javascripts/mr_notes/stores/index.js has differences between CE and EE.

Diferences

diff --git a/home/yorickpeterse/Projects/gitlab/gdk-ce/gitlab/app/assets/javascripts/mr_notes/stores/index.js b/home/yorickpeterse/Projects/gitlab/gdk-ee/gitlab/app/assets/javascripts/mr_notes/stores/index.js
index c4225c8ec08..c52ad4ceb65 100644
--- a/home/yorickpeterse/Projects/gitlab/gdk-ce/gitlab/app/assets/javascripts/mr_notes/stores/index.js
+++ b/home/yorickpeterse/Projects/gitlab/gdk-ee/gitlab/app/assets/javascripts/mr_notes/stores/index.js
@@ -2,6 +2,7 @@ import Vue from 'vue';
 import Vuex from 'vuex';
 import notesModule from '~/notes/stores/modules';
 import diffsModule from '~/diffs/store/modules';
+import batchCommentsModule from 'ee/batch_comments/stores/modules/batch_comments';
 import mrPageModule from './modules';
 
 Vue.use(Vuex);
@@ -12,6 +13,7 @@ export const createStore = () =>
       page: mrPageModule,
       notes: notesModule(),
       diffs: diffsModule(),
+      batchComments: batchCommentsModule(),
     },
   });

What needs to be done

1. Create a module that stubs batchCommentsModule in CE - all actions that are used in components and getters must exist in the CE counterpart.
2. Use ee_else_ce to import the module