Handle expired CI job artifacts with orphaned projects

Stan Hurequested to merge
sh-handle-orphaned-artifacts-destroy into master

What does this MR do and why?

Previously when a project were destroyed without cleaning up its CI job artifacts, ExpireBuildArtifactsWorker would log errors every time it came across this artifact. This might block CI job artifacts from being expired.

We now handle the nil project case and destroy the artifact.

Relates to #497426 (closed)

Edited by Stan Hu

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