version: error on invalid --output

[mark-liu]

Fixes #6032.

Currently, kustomize version --output=yml (or any unsupported value) exits 0 and prints nothing, because the invalid value falls through the switch in Options.Run().

This change validates --output in Options.Validate() and returns an error matching kubectl's phrasing.

Includes a unit test for the invalid output case.

[k8s-ci-robot]

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• ✅ login: mark-liu / name: Mark Liu (bb4005d)

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[k8s-ci-robot]

Hi @mark-liu. Thanks for your PR.

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[koba1t]

I'm very sorry, but this PR is a duplicate of #6033, so I'm going to close.
/close

[k8s-ci-robot]

@koba1t: Closed this PR.

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In response to this:

I'm very sorry, but this PR is a duplicate of #6033, so I'm going to close.
/close

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