Please add the ability to always show the user's E-Mail (not public_email)

This MR new in 11.8 is hiding user E-Mails. Including in data sent to web hooks: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/24533

We run an in-house EE installation. All users are employees or contractors, we don't want users to be able to change this, and you can figure out everyone's E-Mail from the staff directory. There should be some global setting to disable this feature. For now we just:

gitlabhq_production=# update users set public_email = email where public_email = '';