Merge branch 'remove-job-age-from-jobs-api-ff' into 'master'

Remove job_age from jobs/request API endpoint

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/118045



Merged-by: Stan Hu <stanhu@gmail.com>
Approved-by: Max Fan <mfan@gitlab.com>
Approved-by: Stan Hu <stanhu@gmail.com>
Reviewed-by: Max Fan <mfan@gitlab.com>
Co-authored-by: Hordur Freyr Yngvason <hfyngvason@gitlab.com>