Merge branch 'update-values-of-usage-log-records' into 'main'

Expose started_at and finished_at values in Usage Log job details

Closes #38709

See merge request gitlab-org/gitlab-runner!5484



Merged-by: Tomasz Maczukin <tomasz@maczukin.pl>
Approved-by: Romuald Atchadé <ratchade@gitlab.com>