Merge branch 'jachapman-fix-ff-drag-and-drop' into 'master'

Fix drag-and-drop on Firefox

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/151676



Merged-by: Eduardo Sanz García <esanz-garcia@gitlab.com>
Approved-by: Eduardo Sanz García <esanz-garcia@gitlab.com>
Reviewed-by: Eduardo Sanz García <esanz-garcia@gitlab.com>
Reviewed-by: Andrei Zubov <azubov@gitlab.com>
Co-authored-by: Jack Chapman <jachapman@gitlab.com>

app/assets/javascripts/sortable/constants.js

@@ -14,7 +14,6 @@ export const DRAG_DELAY = 100;
  */
 export const defaultSortableOptions = {
   animation: 200,
-  forceFallback: true,
   fallbackClass: DRAG_CLASS,
   fallbackOnBody: true,
   ghostClass: 'is-ghost',

ee/spec/frontend/related_items_tree/components/tree_root_spec.js

@@ -110,7 +110,6 @@ describe('RelatedItemsTree', () => {
                 expect.objectContaining({
                   animation: '200',
                   delay: '100',
-                  forcefallback: 'true',
                   fallbackclass: 'is-dragging',
                   ghostclass: 'is-ghost',
                   group: 'gl-new-card-body',