Grant kubernetes-release-test GCB GCR admin on k8s-staging-kubernetes

[justaugustus]

This is required for VDF as we need to continue running stages/releases
from the old project while publishing container images to new project.

Also, we drop membership for that svc acct to the releng-editors group.
It was a previous experiment that didn't actually work (hence this
commit).

Signed-off-by: Stephen Augustus [email protected]

/assign @dims @thockin @listx
cc: @kubernetes/release-engineering

ref: kubernetes/release#1230, kubernetes/release#270, kubernetes/release#911

Example failure: https://console.cloud.google.com/cloud-build/builds/e7beb8a7-f06b-4db9-aff5-00de05757dfb;step=2?project=kubernetes-release-test

================================================================================
CHECK PREREQUISITES  (1/6)
================================================================================

Checking required system packages: OK
Checking required PIP packages: OK
Skipping security_layer::auth_check...
Checking Docker version: OK
Verifying Docker CLI Experimental status: OK
Checking write access to registry gcr.io/k8s-staging-kubernetes: FAILED
[2020-Jul-18 22:56:02 UTC] check_prerequisites in 5s
FAILED in check_prerequisites.

RELEASE INCOMPLETE! Exiting...


anago: DONE main on 9002e5d1184f Sat Jul 18 22:56:02 UTC 2020 in 5s

[hasheddan]

/lgtm

[dims]

/approve
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dims, hasheddan, justaugustus

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