feat: Add AKS H100 NCCL All-Reduce performance runtime

[xdu31]

Problem

The h100-aks-ubuntu-training overlay references nccl-all-reduce-bw in its validation performance checks, added in #415, but there is no AKS TrainingRuntime template at validators/performance/testdata/h100/aks/runtime.yaml. The NCCL validator would fail at resource application time because it cannot find a service-specific runtime for AKS.

Currently only EKS and GKE have runtime templates:

• validators/performance/testdata/h100/eks/runtime.yaml (EFA)
• validators/performance/testdata/h100/gke/runtime.yaml (TCPXO/FastRak)

What's needed

AKS H100 (ND H100 v5 / ND H200 v5) uses InfiniBand for GPU-to-GPU communication. The AKS runtime needs:

• IB-specific NCCL environment variables (NCCL_IB_HCA, NCCL_IB_GID_INDEX, etc.)
• No TCPXO sidecar (IB is kernel-native, no userspace daemon needed)
• AKS-specific node selector and tolerations
• Appropriate MPI network interface configuration for IB

Affected overlay

• recipes/overlays/h100-aks-ubuntu-training.yaml#L58-L60

References

• AKS recipe overlays PR: feat: Add AKS (Azure Kubernetes Service) H100 recipe overlays #415
• EKS runtime (EFA): validators/performance/testdata/h100/eks/runtime.yaml
• GKE runtime (TCPXO/FastRak): validators/performance/testdata/h100/gke/runtime.yaml
• NCCL constraint implementation: validators/performance/nccl_all_reduce_bw_constraint.go

[xdu31]

@Jont828 The AKS H100 training overlay added in #415 references the nccl-all-reduce-bw performance check, but we don't have an AKS TrainingRuntime template yet. We have EKS (EFA) and GKE (TCPXO/FastRak) runtimes — AKS needs an IB-specific one.

Could you help implement and test validators/performance/testdata/h100/aks/runtime.yaml on an AKS H100 cluster? You can refer to Testing with custom images for building and running with a local validator image.