[Feature] Expose pcieRoot and numaNode in KEP-5304 device metadata

[johnahull]

Summary

Expose standardized PCIe-root and NUMA topology in KEP-5304 device metadata returned during claim preparation.

Current state

resource.kubernetes.io/pcieRoot is published in GPU and Gaudi ResourceSlices, but prepared-device metadata currently contains only resource.kubernetes.io/pciBusID. NUMA metadata is not published.

Scope

• Include resource.kubernetes.io/pcieRoot in KEP-5304 preparation metadata.
• Include standardized resource.kubernetes.io/numaNode metadata once KEP-6072 support lands.
• Keep ResourceSlice attributes and preparation metadata consistent.
• Add kubelet-plugin tests covering both metadata attributes.

[byako]

Thank you for the contribution.
This is planned for the next minor release.