Merge branch 'bdenkovych-remove-members_api_expose_enterprise_users_emails_only-ff' into 'master'

Remove members_api_expose_enterprise_users_emails_only feature flag

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/144026



Merged-by: Stan Hu <stanhu@gmail.com>
Approved-by: Stan Hu <stanhu@gmail.com>
Co-authored-by: Bogdan Denkovych <bdenkovych@gitlab.com>