WIP: Convert kubectl test-cmd tests to testscript

[soltysh]

What type of PR is this?

/kind cleanup
/sig testing
/sig cli

What this PR does / why we need it:

This was brought up in #135478 and discussing during SIG-CLI on Dec 10th.

This PR serves as an example to show how the rewrite will look like.

Which issue(s) this PR is related to:

Ref: #135478

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

[k8s-ci-robot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[k8s-ci-robot]

This issue is currently awaiting triage.

If a SIG or subproject determines this is a relevant issue, they will accept it by applying the triage/accepted label and provide further guidance.

The triage/accepted label can be added by org members by writing /triage accepted in a comment.

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: soltysh

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• OWNERS [soltysh]
• LICENSES/OWNERS [soltysh]
• test/OWNERS [soltysh]
• vendor/OWNERS [soltysh]

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[soltysh]

/test pull-kubernetes-integration

[k8s-ci-robot]

@soltysh: The following test 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-kubernetes-integration	a92caaa	link	true	/test pull-kubernetes-integration

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.

Details

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository. I understand the commands that are listed here.