Given an AR docker image (e.g. us-central1-docker.pkg.dev/some-project/some-repo/some-image@sha256:abcdef1234), return the latest created AR docker image with the same name.

Should also support:

• tagged images (e.g. us-central1-docker.pkg.dev/some-project/some-repo/some-image:some-tag)
• untagged images (e.g. us-central1-docker.pkg.dev/some-project/some-repo/some-image)