LYNX-303: Added in storeConfig graphql query

Author: sumesh-GL

app/code/Magento/QuoteGraphQl/etc/graphql/di.xml

@@ -65,6 +65,7 @@
             <argument name="extendedConfigData" xsi:type="array">
                 <item name="is_guest_checkout_enabled" xsi:type="string">checkout/options/guest_checkout</item>
                 <item name="is_one_page_checkout_enabled" xsi:type="string">checkout/options/onepage_checkout_enabled</item>
+                <item name="max_items_in_order_summary" xsi:type="string">checkout/options/max_items_display_count</item>
             </argument>
         </arguments>
     </type>

app/code/Magento/QuoteGraphQl/etc/schema.graphqls

@@ -445,4 +445,5 @@ enum CartUserInputErrorType {
 type StoreConfig {
     is_guest_checkout_enabled: Boolean @doc(description: "Extended Config Data - checkout/options/guest_checkout")
     is_one_page_checkout_enabled: Boolean @doc(description: "Extended Config Data - checkout/options/onepage_checkout_enabled")
+    max_items_in_order_summary: Int @doc(description: "Extended Config Data - checkout/options/max_items_display_count")
 }

dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/GetMaxItemsInOrderSummaryTest.php

@@ -0,0 +1,57 @@
+<?php
+/**
+ * Copyright 2023 Adobe
+ * All Rights Reserved.
+ *
+ * NOTICE: All information contained herein is, and remains
+ * the property of Adobe and its suppliers, if any. The intellectual
+ * and technical concepts contained herein are proprietary to Adobe
+ * and its suppliers and are protected by all applicable intellectual
+ * property laws, including trade secret and copyright laws.
+ * Dissemination of this information or reproduction of this material
+ * is strictly forbidden unless prior written permission is obtained from
+ * Adobe.
+ */
+declare(strict_types=1);
+
+namespace Magento\GraphQl\Quote;
+
+use Magento\Framework\DataObject;
+use Magento\TestFramework\Fixture\Config;
+use Magento\TestFramework\TestCase\GraphQlAbstract;
+
+/**
+ * Test for getting max_items_in_order_summary from storeConfig query
+ */
+class GetMaxItemsInOrderSummaryTest extends GraphQlAbstract
+{
+    private const MAX_ITEMS_TO_DISPLAY = 5;
+
+    #[
+        Config('checkout/options/max_items_display_count', self::MAX_ITEMS_TO_DISPLAY)
+    ]
+    public function testGetMaxItemsInOrderSummary()
+    {
+        $query = $this->getQuery();
+        $response = $this->graphQlMutation($query);
+        $responseDataObject = new DataObject($response);
+
+        self::assertEquals(self::MAX_ITEMS_TO_DISPLAY, $responseDataObject->getData('storeConfig/max_items_in_order_summary'));
+    }
+
+    /**
+     * Create storeConfig query
+     *
+     * @return string
+     */
+    private function getQuery(): string
+    {
+        return <<<QUERY
+{
+  storeConfig {
+    max_items_in_order_summary
+  }
+}
+QUERY;
+    }
+}