Merge branch 'pedropombeiro/509985/return-error-for-orphaned-runners' into 'master'

Return explicit error for REST requests on orphaned runner

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/176035



Merged-by: Pedro Pombeiro <noreply@pedro.pombei.ro>
Approved-by: Marius Bobin <mbobin@gitlab.com>
Approved-by: Tianwen Chen <tchen@gitlab.com>
Reviewed-by: Pedro Pombeiro <noreply@pedro.pombei.ro>
Reviewed-by: Tianwen Chen <tchen@gitlab.com>