Relax volumeContentSource restriction for ROX multi-zone dynamic volume creation

[pwschuurman]

This enables empty ROX multi-zone PVCs to be created, to allow for static hydration of disks

What type of PR is this?

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/kind api-change
/kind bug
/kind cleanup
/kind design
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/kind failing-test
/kind feature
/kind flake

What this PR does / why we need it: Currently ROX multi-zone volumes can only be created from a volume source (eg: snapshot/disk image). This limits the flexibility of a user that wants to create a ROX multi-zone volume which is empty, and then write the same data individually to each created disk. This allows all disks to share the same name (as they are part of a "multi-zone" volume), but have data populated without needing to pre-create a snapshot/disk image (as copying data directly to each individual disk in parallel can be faster than creating and restoring from a snapshot).

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Relax multi-zone volume ROX restriction when creating a volume without a volumeContentSource.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: pwschuurman

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[pwschuurman]

/retest

[pwschuurman]

/retest

[pwschuurman]

/retest

[pwschuurman]

/retest

[pwschuurman]

/test pull-gcp-compute-persistent-disk-csi-driver-e2e

[pwschuurman]

/test pull-gcp-compute-persistent-disk-csi-driver-e2e

[pwschuurman]

/assign @dannawang0221

[dannawang0221]

lgtm

[dannawang0221]

/lgtm

[pwschuurman]

/cherrypick release-1.17

[k8s-infra-cherrypick-robot]

@pwschuurman: new pull request created: #2036

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In response to this:

/cherrypick release-1.17

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