[CI] Restore SMG e2e on 2-gpu-h100 / 4-gpu-h100 runners (#24222)

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

sgl-model-gateway/e2e_test/benchmarks/test_regular_perf.py

@@ -22,6 +22,8 @@ class TestRegularPerf:
                 "e2e_latency_mean_max": 14,
                 "input_throughput_mean_min": 800,
                 "output_throughput_mean_min": 12,
-                "gpu_util_p50_min": 99,
+                # gpu_util_p50_min intentionally omitted: see test_pd_perf.py.
+                # On 4-gpu-h100 the median sample lands at 0% for the bursty
+                # grpc workload even when mean is healthy (~22%).
             },
         )