[WIP] 🌱 Add zone placement group label

[fabriziopandini]

What this PR does / why we need it:
Add support for zone placement group label, see vmware-tanzu/vm-operator#909

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[k8s-ci-robot]

@fabriziopandini: The following tests 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-api-provider-vsphere-e2e-govmomi-blocking-main	553fa54	link	true	/test pull-cluster-api-provider-vsphere-e2e-govmomi-blocking-main
pull-cluster-api-provider-vsphere-e2e-supervisor-blocking-main	553fa54	link	true	/test pull-cluster-api-provider-vsphere-e2e-supervisor-blocking-main

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[sbueringer]

@fabriziopandini I think we can close this PR (ping me if you want to chat about details)

[fabriziopandini]

/close

[k8s-ci-robot]

@fabriziopandini: Closed this PR.

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In response to this:

/close

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