images: use k8s-staging-test-infra/gcb-docker-gcloud

[jimdaga]

What type of PR is this?
/kind cleanup

What this PR does / why we need it:
Migrating gcb-docker-gcloud to to community-owned infrastructure

Which issue(s) this PR fixes:
Fixes # Migrate away from google.com gcp project k8s-testimages kubernetes/k8s.io#1523

Special notes for your reviewer:
Related:

• Followup to: images: add/update READMEs to trigger image builds kubernetes/test-infra#23656

Does this PR introduce a user-facing change?:

NONE

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: jimdaga
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[k8s-ci-robot]

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[k8s-ci-robot]

Hi @jimdaga. Thanks for your PR.

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[jimdaga]

Closing this PR after learning that the csi-release-tools repo is the primary location for the cloudbuild.yaml file.