Refactor ci source constructor

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/150522



Merged-by: Hordur Freyr Yngvason <hfyngvason@gitlab.com>
Approved-by: Rutger Wessels <rwessels@gitlab.com>
Approved-by: Hordur Freyr Yngvason <hfyngvason@gitlab.com>
Co-authored-by: mc_rocha <mrocha@gitlab.com>