PWA-1611: Add operation status to DeleteNegotiableQuotesOutput

* Created GraphQL mutation BatchResult class
* Added result_status to closeNegotiableQuotes response output

Author: amolina-adobe

app/code/Magento/GraphQl/Model/Mutation/BatchResult.php

@@ -0,0 +1,17 @@
+<?php
+/*
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\GraphQl\Model\Mutation;
+
+class BatchResult
+{
+    const STATUS_SUCCESS = 'SUCCESS';
+
+    const STATUS_FAILURE = 'FAILURE';
+
+    const STATUS_MIXED = 'MIXED_RESULTS';
+}