Add `updatedAt` prop for Projects

app/assets/javascripts/groups/store/groups_store.js

@@ -91,6 +91,7 @@ export default class GroupsStore {
       subgroupCount: rawGroupItem.subgroup_count,
       memberCount: rawGroupItem.number_users_with_delimiter,
       starCount: rawGroupItem.star_count,
+      updatedAt: rawGroupItem.updated_at,
     };
   }