fix(autoload): Fix PHP Fatal error: ClassFilesSniff namespace clash (#3048092)

  <arg name="extensions" value="php,module,inc,install,test,profile,theme,yml"/>

  <autoload>../Drupal/autoload.php</autoload>

 <!-- We use a static method from a sniff from the other standard, so we need

 this autoload hack here. -->

 <autoload>../Drupal/Sniffs/InfoFiles/ClassFilesSniff.php</autoload>

  <rule ref="Internal.NoCodeFound">

    <!-- Empty files are fine, might be used for testing. -->