Deprecate k8s-staging-release-test and k8s-infra-sig-release-prototype GCP projects

[justaugustus]

• (releng: Update jobs to use new GCP staging project test-infra#16679, gcp: Update GCB and releaselib to use new k8s-staging-releng project #1162) Move image building and image references to k8s-staging-releng
• (Update Release Engineering lists k8s.io#742) Remove IAM groups
• Delete GCP projects

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Details to follow. Opening this so I don't lose the thread.
ref: https://kubernetes.slack.com/archives/CCK68P2Q2/p1583537568133300?thread_ts=1583278896.067700&cid=CCK68P2Q2, kubernetes/k8s.io#624, #911

cc: @thockin

[justaugustus]

Assigning Aaron for the last-mile (project deletions).
/assign @spiffxp
ref: kubernetes/k8s.io#947

[spiffxp]

/close
deleted k8s-staging-release-test (ref: kubernetes/k8s.io#947 (comment))

deleted k8s-sig-release-prototype

$ gcloud projects delete k8s-sig-release-prototype
Deleted [https://cloudresourcemanager.googleapis.com/v1/projects/k8s-sig-release-prototype].

You can undo this operation for a limited period by running the command below.
    $ gcloud projects undelete k8s-sig-release-prototype

[k8s-ci-robot]

@spiffxp: Closing this issue.

In response to this:

/close
deleted k8s-staging-release-test (ref: kubernetes/k8s.io#947 (comment))

deleted k8s-sig-release-prototype

$ gcloud projects delete k8s-sig-release-prototype
Deleted [https://cloudresourcemanager.googleapis.com/v1/projects/k8s-sig-release-prototype].

You can undo this operation for a limited period by running the command below.
   $ gcloud projects undelete k8s-sig-release-prototype

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