Feature: #91354 - Integrate server response security checks

See forge#91354


In order to evaluate potential server misconfigurations and to reduce the potential of security implications in general, a new HTTP response check is integrated to "Environment Status" and the "Security" section in the reports module.


It is evaluated whether non-standard file extensions lead to unexpected handling on the server-side, such as test.php.wrong being evaluated as PHP or test.html.wrong being served with text/html content type.

Details are explained in TYPO3 Security Guidelines for Administrators.