Merge branch 'el-associated-account-pending-deletion' into 'master'

Add error to indicate email is linked to an account pending deletion

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/148369



Merged-by: Eduardo Sanz García <esanz-garcia@gitlab.com>
Approved-by: Arpit Gogia <12347103-arpitgogia@users.noreply.gitlab.com>
Approved-by: Alex Pennells <apennells@gitlab.com>
Approved-by: Sincheol (David) Kim <dkim@gitlab.com>
Approved-by: Eduardo Sanz García <esanz-garcia@gitlab.com>
Reviewed-by: Sincheol (David) Kim <dkim@gitlab.com>
Reviewed-by: Eduardo Sanz García <esanz-garcia@gitlab.com>
Reviewed-by: Arpit Gogia <12347103-arpitgogia@users.noreply.gitlab.com>
Reviewed-by: Alex Pennells <apennells@gitlab.com>
Co-authored-by: Eugie Limpin <elimpin@gitlab.com>