version: error on invalid --output instead of silent success

[dpacgdm]

Summary

• Reject unrecognized --output values for kustomize version with error: --output must be 'yaml' or 'json'
• Add a unit test covering the previous silent-success path (--output=yml)

Addresses #6032 (supersedes stale #6033)

Test plan

• go test ./commands/version/

[kubernetes-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: dpacgdm
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[linux-foundation-easycla]

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[kubernetes-prow]

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[kubernetes-prow]

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