Merge branch 'ahuntsman/add-source-to-jobs-api' into 'master'

Add "source" property of jobs to GraphQL

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/159798



Merged-by: Max Fan <mfan@gitlab.com>
Approved-by: Max Fan <mfan@gitlab.com>
Reviewed-by: Evan Read <eread@gitlab.com>
Reviewed-by: Max Fan <mfan@gitlab.com>
Co-authored-by: Aaron Huntsman <ahuntsman@gitlab.com>