Add option to a gerrit project to permit the disable of the default strict forbidden file verification of an event.

Enabling this option will allow an event to trigger a build if the event contains BOTH one or more wanted file paths/topics/branches AND one or more forbidden file paths.

In other words, with this option, the build will not get triggered if the change contains only forbidden files, otherwise it will get triggered.

A checkbox that has "Disable Strict Forbidden File Verification" shall be added.