[E2E] Optimize the E2E test time. (#5294)

### What this PR does / why we need it?
Add cudagraph_capture_sizes for E2E CI test.

- vLLM version: release/v0.13.0
- vLLM main:
ad32e3e19c

Signed-off-by: menogrey <1299267905@qq.com>

tests/e2e/multicard/test_qwen3_next.py

@@ -36,6 +36,7 @@ def test_qwen3_next_distributed_mp_tp4():
     max_tokens = 5
     with VllmRunner("Qwen/Qwen3-Next-80B-A3B-Instruct",
                     tensor_parallel_size=4,
+                    cudagraph_capture_sizes=[1, 2, 4, 8],
                     max_model_len=4096,
                     gpu_memory_utilization=0.8,
                     distributed_executor_backend="mp") as vllm_model:
@@ -125,6 +126,7 @@ def test_qwen3_next_w8a8dynamic_distributed_tp4_ep():
             gpu_memory_utilization=0.4,
             max_num_seqs=1,
             enable_expert_parallel=True,
+            cudagraph_capture_sizes=[1, 2, 4, 8],
             quantization="ascend",
     ) as vllm_model:
         vllm_model.generate_greedy(example_prompts, max_tokens)