Update job.go

[minzhuogoogle]

Add metadata in order to extract metadata in podinfo.json

[google-oss-prow]

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[google-oss-prow]

Hi @minzhuogoogle. Thanks for your PR.

I'm waiting for a GoogleCloudPlatform member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[michelle192837]

Hi! Just checking, but what's the reason for this addition? (iiuc I think podinfo.json isn't always expected to be uploaded, but the relevant metadata should be present in finished.json if needed)