Artifact sharing doesn't work

[james-panayis]

If user A creates a run, uploads an (output in my use-case) artifact to it, and makes the visibility 'tenant', then user B cannot download that artifact with Client().get_artifact_as_file(...). For now, I have branch james/temp_fix_artifact_retrieval, which fixes it, but I don't know why it works or whether it breaks anything else.

[kzscisoft]

@james-panayis I think I have found a solution using the already available Artifact.from_name(...) low level API function