QuizAccessDeniedSubscriber clutters logs

Problem/Motivation

QuizAccessDeniedSubscriber logs every 404 exception. This can quickly clutter the logs, especially for larger sites. Aside from that the resolution of https://www.drupal.org/node/3498572 is suboptimal as it bypasses the core CustomPageExceptionHtmlSubscriber in favour of an own implementation which would need to be kept updated.

Steps to reproduce

Install the quiz module & make 404 requests.

Proposed resolution

Instead of simply removing the logging line, I think it'd be better to take the approach of webform. By implementing the onException method the other 4xx implementations remain defaulted. That way the core CustomPageExceptionHtmlSubscriber::on404 will be executed again.