fix(recipe): bump NCCL all-reduce bandwidth threshold to 300 Gbps (#350)

Author: xdu31

recipes/overlays/h100-eks-ubuntu-training.yaml

@@ -58,7 +58,7 @@ spec:
         - nccl-all-reduce-bw
       constraints:
         - name: nccl-all-reduce-bw
-          value: ">= 100"
+          value: ">= 300"
     conformance:
       checks:
         - platform-health
@@ -70,4 +70,4 @@ spec:
         - pod-autoscaling
         - cluster-autoscaling
         - robust-controller
-        - secure-accelerator-access
+        - secure-accelerator-access