Add the possibility to skip workbench access check in specific cases

Marking for triage and review.

I don't think this is the right place to make this change, as it changes AccessControlHierarchyInterface (though that is not included in the patch).

If you have a one-site use-case, the recommended solution is to extend the Plugin with your own replacement and use that instead. See the Access Control section of the README.

This article (which includes some salty language) shows how to do that.

https://medium.com/@djphenaproxima/how-to-bend-drupal-8-plugins-to-your-...