[cluster-autoscaler-release-1.30] Adding temporary multizone-nodepool support for CAS

[k8s-infra-cherrypick-robot]

This is an automated cherry-pick of #7013

/assign comtalyst

NONE

[k8s-ci-robot]

@k8s-infra-cherrypick-robot: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-cluster-autoscaler-e2e-azure	bee525b	link	false	/test pull-cluster-autoscaler-e2e-azure

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[comtalyst]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: comtalyst, k8s-infra-cherrypick-robot

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