Changes for allowed_email_domain update audit event

What does this MR do and why?

Changes for allowed_email_domain update audit event

Group setting allowed_email_domains update is an admin action and must be audited

Changelog: added

Solves #486532 (closed) Relates to https://gitlab.com/gitlab-org/gitlab/-/issues/386080

Screenshots or screen recordings

How to set up and validate locally

1. Update allowed email domains for any group
2. Observe a new audit event getting generated for https://docs.gitlab.com/ee/user/compliance/audit_events.html#group-audit-events