Option to require 2FA for admins
Background
In some cases it's desired to require all admins to enable 2FA
Proposal
Add option to require all admins to have 2FA enabled. Workaround for now is https://docs.gitlab.com/ee/security/two_factor_authentication.html#enforce-2fa-for-all-users-in-a-group but not if #21990 changes that for admins.
Edited by Ben Bodenmiller