fix(vm): propagate PV nodeAffinity to VM pod for correct scheduling

[loktev-d]

Description

Propagate PV nodeAffinity to the VM pod so the Kubernetes scheduler respects disk topology constraints when placing VMs.

• PVNodeAffinityTerms in VM state: collects nodeAffinity from PVs backing all block devices (spec refs + attached VMBDAs). Computes the intersection across PVs using cross-product of NodeSelectorTerms.
• ApplyPVNodeAffinity in KVVM builder: merges PV node selector terms into the KVVM pod template affinity, preserving existing VM/class affinity via cross-product.
• nodeaffinity package CrossProductTerms/IntersectTerms logic.

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

What is the expected result?

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: propagate PV nodeAffinity to VM pod for correct scheduling

The base branch was changed.