AC-661: Create phpcs static check for XmlTest

Author: jcuerdo

Magento2/ruleset.xml

@@ -247,6 +247,11 @@
         <severity>8</severity>
         <type>warning</type>
     </rule>
+    <rule ref="Magento2.Legacy.WidgetXML.FoundObsoleteNode">
+        <include-pattern>*\/widget.xml$</include-pattern>
+        <severity>8</severity>
+        <type>warning</type>
+    </rule>
 
     <!-- Severity 7 warnings: General code issues. -->
     <rule ref="Generic.Arrays.DisallowLongArraySyntax">