Clean up `latest` tag in registry.k8s.io

[cpanato]

What happened:

We have some images with the tag latest published in the registry.k8s.io; however, we don't promote or update those images, and using that might cause issues because they might not be using the last release published.

One example is the registry.k8s.io/pause that has the latest tag and the same digest as the 1.0 release; however, we are in the 3.9 release for the pause image.

We should perform a clean up in the registry at some point.

/cc @BenTheElder @liggitt @saschagrunert @dims
cc @kubernetes/release-managers @kubernetes/sig-release-leads
/assign

[sftim]

IMO, this should be at /priority important-longterm

[cpanato]

/priority important-longterm

[ameukam]

/sig k8s-infra
/area artifacts

[dims]

from: https://console.cloud.google.com/gcr/images/k8s-artifacts-prod/us/pause@sha256:a78c2d6208eff9b672de43f880093100050983047b7b0afe0217d3656e1b0d5f/details?project=k8s-artifacts-prod