Use pipeline URL for checkout provenance

For brew/koji builds, we mock checkout information in createrepo jobs. This means that we have different checkout data in each job, and which one ends up in DW will depend on which job gets processed the last.

Thus, we need a unified pointer for the checkout, and the pipeline link is the most fitting one. For git testing, it shows us all the trigger variables too and for MRs, it sends us to a better view too, so it shouldn't harm anything.

Signed-off-by: Veronika Kabatova vkabatov@redhat.com