fix globals within boards_bundle mock data

spec/javascripts/boards/mock_data.js.es6

@@ -56,3 +56,8 @@ const boardsMockInterceptor = (request, next) => {
     status: 200
   }));
 };
+
+window.listObj = listObj;
+window.listObjDuplicate = listObjDuplicate;
+window.BoardsMockData = BoardsMockData;
+window.boardsMockInterceptor = boardsMockInterceptor;