Use FOSS Sortable config in EE

Use common Sortable config in both FOSS
and EE.

app/assets/javascripts/boards/mixins/sortable_default_options.js

 /* global DocumentTouch */
 
-import sortableConfig from 'ee_else_ce/sortable/sortable_config';
+import sortableConfig from '~/sortable/sortable_config';
 
 export function sortableStart() {
   document.body.classList.add('is-dragging');

app/assets/javascripts/related_issues/components/related_issues_list.vue

 <script>
 import { GlLoadingIcon } from '@gitlab/ui';
 import Sortable from 'sortablejs';
-import sortableConfig from 'ee_else_ce/sortable/sortable_config';
+import sortableConfig from '~/sortable/sortable_config';
 import RelatedIssuableItem from '~/vue_shared/components/issue/related_issuable_item.vue';
 
 export default {

ee/app/assets/javascripts/analytics/shared/mixins/sortable_default_options.js

 /* global DocumentTouch */
 
-import sortableConfig from 'ee_else_ce/sortable/sortable_config';
+import sortableConfig from '~/sortable/sortable_config';
 import { NO_DRAG_CLASS } from '../constants';
 
 export default () => {

ee/app/assets/javascripts/sortable/sortable_config.js

-export default {
-  animation: 200,
-  forceFallback: true,
-  fallbackClass: 'is-dragging',
-  fallbackOnBody: true,
-  ghostClass: 'is-ghost',
-  fallbackTolerance: 1,
-};