Remove unused field from APIGroupVersion

[hoskeri]

RootScopedKinds is only present in unit tests, and is not referenced anywhere else.

/kind cleanup

What this PR does / why we need it:

Remove unused field from apiserver public api.

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: hoskeri
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[k8s-ci-robot]

Hi @hoskeri. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[seans3]

/ok-to-test

[seans3]

/triage accepted