[backend] system.ClassificationMetrics artifacts provide a uri but have no source in storage

[Gkrumbach07]

Environment

• How did you deploy Kubeflow Pipelines (KFP)?: k8s

• KFP version: 2.2.0

• KFP SDK version: ??

Steps to reproduce

1. Run a pipeline that produces system.ClassificationMetrics artifacts.
2. In the UI go to the artifacts list page, find that artifact and find its uri
3. notice it says that the key is invalid (s3 error)
4. go to your bucket and see that that artifact is not there.

Expected result

I guess not returning a uri if its not in s3? I guess it could also be fixed by making sure the artifact is in s3, however the data in embedded in custom props for the artifact

Materials and Reference

metric viz pipeline for ref
Pipeline metrics-visualization-pipeline.yaml.zip

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