Add missing Copyright

Author: lbajsarowicz

app/code/Magento/Catalog/Test/Mftf/ActionGroup/AssertStorefrontNoProductsFoundActionGroup.xml

@@ -1,5 +1,10 @@
 <?xml version="1.0" encoding="UTF-8"?>
-
+<!--
+ /**
+  * Copyright © Magento, Inc. All rights reserved.
+  * See COPYING.txt for license details.
+  */
+-->
 <actionGroups xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
               xsi:noNamespaceSchemaLocation="urn:magento:mftf:Test/etc/actionGroupSchema.xsd">
     <actionGroup name="AssertStorefrontNoProductsFoundActionGroup">