Remove nested Promise from admin email select
follow-up of !17094 (merged)
necessary for !17683 (merged) (see failing job: https://gitlab.com/gitlab-org/gitlab/-/jobs/303557101)
follow-up of !17094 (merged)
necessary for !17683 (merged) (see failing job: https://gitlab.com/gitlab-org/gitlab/-/jobs/303557101)