feat(auth): support the standard gce metadata host env #834
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lanbochen-anyscale
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TheKevJames,
cphoward and
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Summary
We have the use case such that we want to override the default gce compute metadata and proxy to other compute nodes (outside of gce) for them to be able to access gcloud APIs. Add
GCE_METADATA_HOSTandGCE_METADATA_ROOTsupport which is google's standard env vars (see https://github.com/googleapis/google-auth-library-python/blob/main/google/auth/compute_engine/_metadata.py#L45).