Add group setting to hide members emails on public facing profile

Proposal

Organizations may have a need or requirement to hide their members emails from the public. Currently, email's are displayed on a user's profile if the user has set a public email and is not provisioned by a group. (Source) This would add another level of enforcement to those who do not fall under the existing criteria.

Currently this is possible for group provisioned users (provisioned_by_group) via a limited feature flag hide_public_email_on_profile #351731. This feature request would ideally be an Organization-configurable replacement for it.

Related discussion: https://gitlab.com/gitlab-org/gitlab/-/issues/351731#note_1087907543