Remove dead code used only in tests

[soltysh]

What type of PR is this?
/kind cleanup

What this PR does / why we need it:
This removes dead code that's being used only in tests.

Special notes for your reviewer:
/assign @sallyom @damemi

Does this PR introduce a user-facing change?:

NONE

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In response to this:

What type of PR is this?
/kind cleanup

What this PR does / why we need it:
This removes dead code that's being used only in tests.

Special notes for your reviewer:
/assign @sallyom @damemi

Does this PR introduce a user-facing change?:

NONE

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/test-infra repository.

[soltysh]

/sig cli
/priority important-longterm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: soltysh

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• pkg/kubectl/OWNERS [soltysh]

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[damemi]

/lgtm

[fejta-bot]

/retest
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