upgrade cluster: support comma separated list for machineType [1.22]

[MeirP-3]

Solves #13171 for v1.22

Not needed in v1.23, since instance types for spotinst are moved to mixedInstancesPolicy: #12549

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[k8s-ci-robot]

Hi @MeirP-3. 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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[MeirP-3]

/check-cla

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The committers are authorized under a signed CLA.

• ✅ Meir Pechthalt (0577da8)

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[olemarkus]

/ok-to-test

[hakman]

Thanks for this fix @MeirP-3!

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This pull-request has been approved by: hakman

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