fix(vm): create network interfaces with deckhouse user

[yaroslavborbat]

Description

Add UID and GID fields to InterfaceSpec, set to deckhouse user (64535) for all VM network interfaces.

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

Tap devices were created with root ownership, causing permission issues for deckhouse user processes. Setting UID/GID explicitly fixes this.

What is the expected result?

VM network interfaces are created with deckhouse user ownership (UID/GID 64535).

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: fix
summary: Create network interfaces with deckhouse user ownership (UID/GID 64535).