fix(vmop): restore with snapshot from saved VD

[danilrwx]

Description

Fixes an issue where a disk in a snapshot does not have a storage class in the spec. During restore from snapshot we miss that storageClass and use default, which it incorrect.

Why do we need it, and what problem does it solve?

With this fix, if there is no storageClass in the spec, we will take the class from the status.

What is the expected result?

Using origin storageClass.

Checklist

• The code is covered by unit tests.
• e2e tests passed.
• Documentation updated according to the changes.
• Changes were tested in the Kubernetes cluster manually.

Changelog entries

section: vmop
type: fix
summary: Using storageClass of VD from status or spec during VMOP Restore or Clone.

[deckhouse-BOaTswain]

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