AC-659: Create phpcs static check for ModuleXMLTest

Author: svera

Magento2/Tests/Legacy/ModuleXMLUnitTest.3.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0"?>
+<!--
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+-->
+<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">
+    <module name="Magento_TestModule2" />
+</config>

Magento2/Tests/Legacy/ModuleXMLUnitTest.php

@@ -32,6 +32,9 @@ public function getWarningList($testFile = '')
                 9 => 2,
             ];
         }
+        if ($testFile === 'ModuleXMLUnitTest.3.xml') {
+            return [];
+        }
         return [];
     }
 }