AC-12755 Improve web api async

Author: tranthienbinh1989

dev/tests/api-functional/testsuite/Magento/Quote/Api/GuestCartManagementTest.php

@@ -354,9 +354,7 @@ public function testPlaceOrder()
     public function testAssignCustomerByGuestUser()
     {
         $this->expectException(\Exception::class);
-        $this->expectExceptionMessage(
-            '{"message":"\"%fieldName\" is required. Enter and try again.","parameters":{"fieldName":"customerId"}}'
-        );
+        $this->expectExceptionMessage('"%fieldName" is required. Enter and try again.');
 
         /** @var $quote \Magento\Quote\Model\Quote */
         $quote = $this->objectManager->create(\Magento\Quote\Model\Quote::class)->load('test01', 'reserved_order_id');