feat(vmsnapshot): add hotplugged image manifests to snapshot

[hardcoretime]

Description

A virtual machine block device attachment that has a reference to a virtual image must also be snapshotted.

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

A virtual machine block device attachment must be restored together with the virtual machine.

What is the expected result?

All virtual machine block device attachments from the virtual machine snapshot will be restored.

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: vmsnapshot
type: feature
summary: "All virtual machine block device attachment manifests are stored in the virtual machine snapshot when it is created."

[deckhouse-BOaTswain]

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