Merge branch '438416-custom-notifications-notification-emails-link-is-blank' into 'master'

Fix "notification emails" link for custom notifications

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/141991



Merged-by: Illya Klymov <xanf@xanf.me>
Approved-by: Thomas Randolph <trandolph@gitlab.com>
Co-authored-by: Martin Wortschack <mwortschack@gitlab.com>