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Description
Fixes #2260. Apparantly, Workload Identity can't directly call the Directory API, instead, Workload Identity should first impersonate the Service Account itself and then call the Directory API
Motivation and Context
Currently, checking Google groups through Workload Identity on GKE, doesn't work. This fixes that issue.
How Has This Been Tested?
Ran it both locally and on a real GKE cluster. Made use of https://github.com/salrashid123/gce_metadata_server locally to simulate a GCP environment as much as possible. Both local and GKE cluster work.
Checklist: