feat: add Google IAM credentials for Redis password #1761
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This is to support Google Memorystore Redis Cluster to use IAM authentication.
See also: https://cloud.google.com/memorystore/docs/cluster/manage-iam-auth
To provide auth, you can use
GOOGLE_APPLICIATION_CREDENTIALS
env variable to buildfarm containers, or, if you are deployed to Google Cloud, you can use native identity binding.