Related items tree: Replace gl-new-card-body naming with crud-body

ee/app/assets/javascripts/related_items_tree/mixins/tree_dd_mixin.js

@@ -13,7 +13,7 @@ export default {
       const options = {
         ...defaultSortableOptions,
         fallbackOnBody: false,
-        group: 'gl-new-card-body',
+        group: 'crud-body',
         tag: 'ul',
         'ghost-class': 'tree-item-drag-active',
         'data-parent-reference': this.parentItem.reference,

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

@@ -118,7 +118,7 @@ describe('RelatedItemsTree', () => {
                   forcefallback: 'true',
                   fallbackclass: 'is-dragging',
                   ghostclass: 'is-ghost',
-                  group: 'gl-new-card-body',
+                  group: 'crud-body',
                   tag: 'ul',
                   'data-parent-reference': mockParentItem.reference,
                   'data-parent-id': mockParentItem.id,