chore(module): add requirements for the sdn module

[universal-itengineer]

Description

Adds the sdn module to the Virtualization module requirements with the minimum supported version >= 0.6.2.

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

Virtualization depends on SDN functionality being available in the Deckhouse cluster. Declaring this dependency in module.yaml makes the requirement explicit and allows Deckhouse to validate that a compatible sdn module is present before running Virtualization.

What is the expected result?

When the Virtualization module is enabled or rendered, Deckhouse sees the sdn >= 0.6.2 module requirement.

The module should only be considered installable when the SDN module version satisfies this requirement.

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: module
type: chore
summary: "Added an explicit dependency on the SDN module version 0.6.2 or newer."