add create regional clone from zonal disk and improve tests

[amacaskill]

What type of PR is this?

/kind feature

What this PR does / why we need it:
GCE recently added creating a regional disk from a zonal disk. This PR adds this feature to volume cloning for the pd csi driver. Manually tested on gke cluster with custom image of external provisioner.
Does this PR introduce a user-facing change?:

Lets users clone a regional disk from a zonal disk if one of the replica zones of the clone matches the zone of the source disk.

[k8s-ci-robot]

Hi @amacaskill. Thanks for your PR.

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[mattcary]

/ok-to-test

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/lifecycle stale

[amacaskill]

/assign @saikat-royc

[saikat-royc]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: amacaskill, saikat-royc

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