Skip some tests on Blackwell (#9777)

Signed-off-by: Hao Lu <14827759+hlu1@users.noreply.github.com>

sgl-kernel/tests/utils.py

@@ -0,0 +1,9 @@
+import torch
+
+
+def is_sm10x():
+    return torch.cuda.get_device_capability() >= (10, 0)
+
+
+def is_hopper():
+    return torch.cuda.get_device_capability() == (9, 0)