Merge branch 'bojan/remove-user_email_lookup_limit' into 'master'

Cleanup `user_email_lookup_limit` attribute

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/136886



Merged-by: Halil Coban <hcoban@gitlab.com>
Approved-by: Arpit Gogia <12347103-arpitgogia@users.noreply.gitlab.com>
Approved-by: Halil Coban <hcoban@gitlab.com>
Reviewed-by: Bojan Marjanovic <bmarjanovic@gitlab.com>
Co-authored-by: bmarjanovic <bmarjanovic@gitlab.com>
Co-authored-by: Ashraf Khamis <akhamis@gitlab.com>