feat(vi,vd): add storage class ready condition, waiting in pending while storage class not ready

[eofff]

Description

Introduces a readiness condition and validation for StorageClass specified in VirtualImage and VirtualDisk. If the specified StorageClass is not ready, the resource will remain in a pending state.

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

What is the expected result?

Checklist

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