fix(vm): fix errors with power state operations

[LopatinDmitr]

Description

• Add checks for current restarts when attempting to start a VM with AlwaysOn.
• In the sync_powerstate.go handler, add a check for the deletion of the current VM.
• Add a check for the current status of StateChangeRequests when creating a new request.

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

This PR fix errors with power state operations. For example:

[
  {
    "controller": "vm-controller",
    "name": "head-ec22cb89-vm-automatic-conf",
    "namespace": "head-ec22cb89-testcases-vm-configuration",
    "msg": "failed to sync powerstate: failed to start VM: unable to complete request: stop/start already underway",
    "err": null,
    "source": "usr/local/go/src/virtualization-controller/pkg/controller/vm/internal/sync_power_state.go:82"
  },
  {
    "controller": "vm-controller",
    "name": "head-ec22cb89-vm-manual-conf",
    "namespace": "head-ec22cb89-testcases-vm-configuration",
    "msg": "failed to sync powerstate: add annotation to KVVM: internalvirtualizationvirtualmachines.internal.virtualization.deckhouse.io \"head-ec22cb89-vm-manual-conf\" not found",
    "err": null,
    "source": "usr/local/go/src/virtualization-controller/pkg/controller/vm/internal/sync_power_state.go:82"
  }
]

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: fix errors with power state operations
impact_level: low

[Isteb4k]

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