test-label-analyzer: add uploading to target gcs bucket

[dhiller]

Is your feature request related to a problem? Please describe:
Currently we have some glue code inside the call to test-label-analyzer that copies the output file to the gcs storage. It would make more sense to add this destination as a flag to the tool and let it do that (similarly as we do in the flakefinder report)

Failure: https://prow.ci.kubevirt.io/view/gs/kubevirt-prow/logs/periodic-kubevirt-quarantined-tests-daily-report/1884492940848402432

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