Remove check on snapshot create support for multi-writer HyperDisk-HA

[sumanthsuresh1117]

Let such validations occur at the PD control plane layer as the support will evolve/change going forward and it's better for the CSI-driver layer to not test such supportability.

What type of PR is this?
bug

What this PR does / why we need it:
Removes an unnecessary and potentially incorrect check that multi-writer Hyperdisk doesn't support snapshot. Hyperdisk is in the process of supporting this functionality and the CSI-driver must defer such checks to the PD control plane.

Does this PR introduce a user-facing change?:

NONE

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

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[tonyzhc]

/ok-to-test

[tonyzhc]

/lgtm

[msau42]

/approve

As a followup, should we add an e2e test that takes a snapshot of a hyperdisk-ha disk?

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: msau42, sumanthsuresh1117

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[tonyzhc]

/approve

As a followup, should we add an e2e test that takes a snapshot of a hyperdisk-ha disk?

Filed b/427994669