Track2 sdk: add GetVirtualMachineScaleSetPublicIPAddress to pip client

[MartinForReal]

What type of PR is this?

/kind feature

What this PR does / why we need it:

Track2 sdk: add GetVirtualMachineScaleSetPublicIPAddress to pip client

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[k8s-ci-robot]

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[nilo19]

Why is it only needed in interface?

[MartinForReal]

It is invoked here

cloud-provider-azure/pkg/provider/azure_vmss.go

Line 647 in d53fb4a

pip, err := ss.PublicIPAddressesClient.GetVirtualMachineScaleSetPublicIPAddress(ctx, resourceGroupName, virtualMachineScaleSetName, virtualMachineIndex, networkInterfaceName, IPConfigurationName, publicIPAddressName, "")

[MartinForReal]

Because it is implemented in anonymous attribute here

cloud-provider-azure/pkg/azclient/interfaceclient/zz_generated_client.go

Line 36 in d53fb4a

*armnetwork.InterfacesClient

[nilo19]

/lgtm