🌱 add DisableCertPrivateKey function for clustercache for test flake

[ivelichkovich]

What this PR does / why we need it: Disables private key generation until the function is removed to fix flake when mutex locks and privatekey generation takes a long time.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes # #12785

[k8s-ci-robot]

Hi @ivelichkovich. Thanks for your PR.

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[sbueringer]

Thank you very much!

/area machine
/ok-to-test
/lgtm
/approve

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: dd8ff63cc8c6d5a3e6fd13845d7b340ec12ebad6

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sbueringer

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