fix(vm): prevent a false "Restart Required" condition when restarting the VM

[LopatinDmitr]

Description

• Add a check for kvvmm.Status.StateChangeRequests before setting the AwaitingRestartToApplyConfiguration condition.
• Skip volume migration when VM has RestartRequired status or pending RestartAwaitingChanges. This prevents patching KVVM volume spec while there are unapplied configuration changes waiting for a restart.

What is the expected result?

• The VM controller now checks for kvvmm.Status.StateChangeRequests and skips setting the spurious AwaitingRestartToApplyConfiguration condition.
• Volume migration is skipped when the VM is in RestartRequired state or has a pending RestartAwaitingChanges condition, ensuring the KVVM volume spec is not modified while unapplied configuration changes are still awaiting a restart.

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: vm
type: fix
summary: Prevent a false "Restart Required" condition when  restarting the VM.