feat(vmop): add Restore operation

[danilrwx]

Description

This pull request implements a comprehensive VM restore operation feature. The changes include:

• Added new Restore operation type to VirtualMachineOperationType.
• Added maintenance condition support for VMs during restore operations
• Implemented restore controller with comprehensive resource management
• Added support for resource tracking during restore operations
• Enhanced CRD definitions with restore operation specifications

The implementation provides three restore modes:

• DryRun: Validates compatibility without making changes
• Strict: Restores exactly as in the snapshot, failing if dependencies are missing
• BestEffort: Restores while handling missing external dependencies gracefully

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

Virtual machine snapshots are essential for backup and disaster recovery scenarios, but without a proper restore mechanism, snapshots are only half of the solution. The feature solves the problem of having snapshots without a standardized, reliable way to restore them, ensuring VMs can be recovered with proper dependency validation and conflict resolution.

What is the expected result?

1. Create restore operations using the new VirtualMachineOperation with type: Restore
2. Specify restore parameters including the source snapshot name and restore mode
3. Monitor restore progress through the operation status and resource tracking
4. Handle restore conflicts through different restore modes (Strict vs BestEffort)
5. Validate restore compatibility using DryRun mode before actual restoration

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: core
type: feature
summary: Add Restore VirtualMachineOperation

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