fix(vd,vi): prevent empty storage class in allowedStorageClassSelector

[loktev-d]

Description

Added validation to prevent empty strings in allowedStorageClassSelector.matchNames configuration for VirtualDisks and VirtualImages. The fix includes:

• OpenAPI schema validation with minLength: 1 for array items
• Runtime validation in controller startup that fails fast if empty env vars are detected

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

When allowedStorageClassSelector.matchNames: [""] was configured in ModuleConfig the restriction didn't work, allowing creation of disks with any storage class

What is the expected result?

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: vd,vi
type: fix
summary: Prevent empty strings in allowedStorageClassSelector configuration for VirtualDisks and VirtualImage

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