Support strong-typing for --target values

[justinsb]

A small cleanup that makes our code a little more robust.

[justinsb]

/milestone 1.32

[k8s-ci-robot]

@justinsb: The provided milestone is not valid for this repository. Milestones in this repository: [backlog, v1.20, v1.21, v1.22, v1.23, v1.24, v1.25, v1.26, v1.27, v1.28, v1.29, v1.30, v1.31, v1.32]

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/milestone 1.32

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[k8s-ci-robot]

@justinsb: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-kops-e2e-cni-flannel	c60d7a9	link	true	/test pull-kops-e2e-cni-flannel
pull-kops-e2e-gce-cni-calico	c60d7a9	link	true	/test pull-kops-e2e-gce-cni-calico
pull-kops-e2e-gce-cni-cilium	c60d7a9	link	true	/test pull-kops-e2e-gce-cni-cilium
pull-kops-e2e-gce-cni-kindnet	c60d7a9	link	true	/test pull-kops-e2e-gce-cni-kindnet

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hakman

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