[CI/Build] Resolve hardware-nested perf baselines per concurrency sweep (#5845)

Signed-off-by: wangyu <410167048@qq.com>
Signed-off-by: [Your Name] <your.email@example.com>
Co-authored-by: amy-why-3459 <wuhaiyan17@huawei.com>

tests/dfx/perf/scripts/diffusion_result_template.json

@@ -21,10 +21,12 @@
       "num-input-images": 0,
       "enable-negative-prompt": false,
       "baseline": {
-        "throughput_qps": 0,
-        "latency_mean": 0,
-        "peak_memory_mb_max": 0,
-        "peak_memory_mb_mean": 0
+        "H100": {
+          "throughput_qps": 0,
+          "latency_mean": 0,
+          "peak_memory_mb_max": 0,
+          "peak_memory_mb_mean": 0
+        }
       }
     },
     "result": {