fix(vdsnapshot): resolve fsfreeze race condition

[hardcoretime]

Description

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

Sometimes, when the virtual disk snapshot controller creates a batch of snapshots with required consistency, a race condition in the freeze or unfreeze filesystem operation can cause an inconsistent snapshot. To prevent this, the KubeVirt virtual machine instance is now annotated with a "freeze" or "unfreeze" request, and the service checks that the type of this request matches the fsFreezeStatus. The fsFreezeStatus is considered trusted only if it matches the request type.

What is the expected result?

Snapshots with required consistency now execute without race conditions in the filesystem freeze process.

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: vdsnapshot
type: fix
summary: "Snapshots with required consistency now execute without race conditions in the filesystem freeze process."