[Fix] Coordinate FullCG prefix variants across DP ranks (#37888)

Co-authored-by: Lianmin Zheng <lianminzheng@gmail.com>

test/registered/unit/model_executor/test_prefill_cuda_graph_runner.py

@@ -458,6 +458,7 @@ class TestPrefillCudaGraphRunnerChunkedPrefix(CustomTestCase):
             forward_mode=SimpleNamespace(is_target_verify=lambda: False),
             capture_hidden_mode=CaptureHiddenMode.NULL,
             global_num_tokens_cpu=None,
+            dp_prefill_cuda_graph_max_prefix_len=0,
             return_logprob=False,
             extend_prefix_lens_cpu=[8],
         )