MC-31420: [GraphQL] Flat Rate shipping amount is returned as $10 instead of $5 for 1st configurable product in cart.

- Added fixture

Author: Prabhu Ram

dev/tests/integration/testsuite/Magento/GraphQl/Quote/_files/set_address_quote_with_configurable_product.php

@@ -0,0 +1,43 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+use Magento\Framework\Api\DataObjectHelper;
+use Magento\Quote\Api\Data\AddressInterface;
+use Magento\Quote\Api\Data\AddressInterfaceFactory;
+use Magento\Quote\Model\QuoteFactory;
+use Magento\Quote\Model\ResourceModel\Quote as QuoteResource;
+use Magento\Quote\Model\ShippingAddressManagementInterface;
+use Magento\TestFramework\Helper\Bootstrap;
+
+/** @var QuoteFactory $quoteFactory */
+$quoteFactory = Bootstrap::getObjectManager()->get(QuoteFactory::class);
+/** @var QuoteResource $quoteResource */
+$quoteResource = Bootstrap::getObjectManager()->get(QuoteResource::class);
+/** @var AddressInterfaceFactory $quoteAddressFactory */
+$quoteAddressFactory = Bootstrap::getObjectManager()->get(AddressInterfaceFactory::class);
+/** @var DataObjectHelper $dataObjectHelper */
+$dataObjectHelper = Bootstrap::getObjectManager()->get(DataObjectHelper::class);
+/** @var ShippingAddressManagementInterface $shippingAddressManagement */
+$shippingAddressManagement = Bootstrap::getObjectManager()->get(ShippingAddressManagementInterface::class);
+
+$quoteAddressData = [
+    AddressInterface::KEY_TELEPHONE => 3468676,
+    AddressInterface::KEY_POSTCODE => '75477',
+    AddressInterface::KEY_COUNTRY_ID => 'US',
+    AddressInterface::KEY_CITY => 'CityM',
+    AddressInterface::KEY_COMPANY => 'CompanyName',
+    AddressInterface::KEY_STREET => 'Green str, 67',
+    AddressInterface::KEY_LASTNAME => 'Smith',
+    AddressInterface::KEY_FIRSTNAME => 'John',
+    AddressInterface::KEY_REGION_ID => 1,
+];
+$quoteAddress = $quoteAddressFactory->create();
+$dataObjectHelper->populateWithArray($quoteAddress, $quoteAddressData, AddressInterfaceFactory::class);
+
+$quote = $quoteFactory->create();
+$quoteResource->load($quote, 'test_cart_with_configurable', 'reserved_order_id');
+$shippingAddressManagement->assign($quote->getId(), $quoteAddress);