Add --control-plane-volume-type flag to kops create cluster

[Camila-B]

• Closes Please add --control-plane-volume-type to kops create cluster #17620
• Only adds the --control-plane-volume-type flag and doesn't add any additional validation for the value passed in

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @Camila-B. 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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[hakman]

/ok-to-test

[Camila-B]

/assign @hakman