Prevent orphaned JobArtifacts in SSF
In !75264 (merged) we added JobArtifacts to SSF but now we also need a bulk removal of items similar to what we did for uploads !69763 (merged).
When we added this functionality to Uploads we didn't embed it to SSF itself because with the only single type it's hard to foresee the requirements, now it seems like a good time to do that. Ideally, it should be handled by SSF and should not require any attention for future blobs.