Fix batch comments tests

Was caused by the Vuex store import importing the wrong store file.

Closes https://gitlab.com/gitlab-org/gitlab-ee/issues/10190

ee/app/assets/javascripts/batch_comments/index.js

 import Vue from 'vue';
 import { mapState, mapActions } from 'vuex';
-import store from '~/mr_notes/stores';
+import store from 'ee_else_ce/mr_notes/stores';
 import ReviewBar from './components/review_bar.vue';
 
 // eslint-disable-next-line import/prefer-default-export

ee/spec/features/merge_request/batch_comments_spec.rb

 require 'rails_helper'
 
-describe 'Merge request > Batch comments', :js, :quarantine do
+describe 'Merge request > Batch comments', :js do
   include MergeRequestDiffHelpers
   include RepoHelpers