[https://nvbugs/6344108][fix] skip TestNemotron3Super120B on pre-blackwell (#15539)

Signed-off-by: Bo Deng <deemod@nvidia.com>

Author: bo-nv

tests/integration/defs/accuracy/test_disaggregated_serving.py

@@ -2085,6 +2085,7 @@ def test_nvfp4(self):
 
 
 @pytest.mark.timeout(DEFAULT_TEST_TIMEOUT)
+@skip_pre_blackwell
 @pytest.mark.skip_less_device_memory(80000)
 class TestNemotron3Super120B(LlmapiAccuracyTestHarness):
     MODEL_NAME = "nvidia/Nemotron-Super-V3"