feat(vm): add --from-file flag to vlct for displaying domain from file

[yaroslavborbat]

Description

Extend the vlct command with a --from-file flag that allows users to display domain information directly from a local libvirt XML file

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

The live domain information retrieved from virt-launcher provides only a limited subset of the complete domain configuration. The libvirt XML file contains the full, detailed domain specification including all devices, features, and settings. This flag enables operators to inspect the complete domain definition for debugging, validation, or documentation purposes without relying on the live instance's filtered view.

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: feature
summary: Extend the `vlct` command with a `--from-file` flag that allows users to display domain information directly from a local libvirt XML file