PB-108 static test fix - add copyright

Author: paras89

app/code/Magento/PageBuilder/Test/Mftf/ActionGroup/ContentTypeColumnActionGroup/DragExistingColumnToExistingColumnLineActionGroup.xml

@@ -1,3 +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="dragExistingColumnToExistingColumnLine">