Use new location for Prow images instead of old.

[michelle192837]

Prow images have been published to a new location for a while now (us-docker.pkg.dev/k8s-infra-prow/images/). These should be the same images as published to the old location, so update images to pull from the new location instead.

Also updated a couple of spots that reference the old gcr.io/k8s-prow location (in the README.md and the Makefile).

Ref #32432

[michelle192837]

/hold

Until Monday.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: chases2, michelle192837

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Needs approval from an approver in each of these files:

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• config/jobs/kubernetes/sig-k8s-infra/trusted/OWNERS [chases2,michelle192837]

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[michelle192837]

/hold cancel

I'll keep an eye on the autobump later to make sure it picks up the changes correctly.

[k8s-ci-robot]

@michelle192837: Updated the following 2 configmaps:

• job-config configmap in namespace default at cluster test-infra-trusted using the following files:
  • key sig-k8s-infra-prow.yaml using file config/jobs/kubernetes/sig-k8s-infra/trusted/sig-k8s-infra-prow.yaml
  • key sig-k8s-infra-test-infra.yaml using file config/jobs/kubernetes/sig-k8s-infra/trusted/sig-k8s-infra-test-infra.yaml
  • key sig-testing-branchprotector.yaml using file config/jobs/kubernetes/sig-k8s-infra/trusted/sig-testing-branchprotector.yaml
  • key test-infra-checkconfig.yaml using file config/jobs/kubernetes/test-infra/test-infra-checkconfig.yaml
  • key test-infra-presubmits.yaml using file config/jobs/kubernetes/test-infra/test-infra-presubmits.yaml
  • key test-infra-trusted.yaml using file config/jobs/kubernetes/test-infra/test-infra-trusted.yaml
• config configmap in namespace default at cluster test-infra-trusted using the following files:
  • key config.yaml using file config/prow/config.yaml

In response to this:

Prow images have been published to a new location for a while now (us-docker.pkg.dev/k8s-infra-prow/images/). These should be the same images as published to the old location, so update images to pull from the new location instead.

Also updated a couple of spots that reference the old gcr.io/k8s-prow location (in the README.md and the Makefile).

Ref #32432

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