✨ envtest: search the assets index for latest of a release series

[cbandy]

This lets one configure the DownloadBinaryAssetsVersion field of envtest.Environment with only the Major.Minor portions of a Kubernetes API version. When DownloadBinaryAssets is set, the framework will search the asset index for the latest stable version in that release series.

This matches the behavior of setup-envtest use {major}.{minor} without the full complexity of version selectors. The leading v is now optional, too.

For example:

• "v1.29" resolves to v1.29.4
• "1.27" resolves to v1.27.1
• "1.24" resolves to v1.24.2

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[k8s-ci-robot]

Hi @cbandy. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[sbueringer]

/ok-to-test