MAGETWO-89238: [Sales email] Disabled invoice emails produce performance issue

Author: RuslanKostiv1

dev/tests/integration/testsuite/Magento/Sales/_files/invoice_list_different_stores_rollback.php

@@ -6,3 +6,10 @@
 declare(strict_types=1);
 
 require 'default_rollback.php';
+
+/** @var \Magento\Config\Model\Config $defConfig */
+$defConfig = \Magento\TestFramework\Helper\Bootstrap::getObjectManager()
+    ->create(\Magento\Config\Model\Config::class);
+$defConfig->setScope(\Magento\Framework\App\Config\ScopeConfigInterface::SCOPE_TYPE_DEFAULT);
+$defConfig->setDataByPath('sales_email/general/async_sending', 0);
+$defConfig->save();