[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/singlecard/test_ilama_lora.py

@@ -51,6 +51,7 @@ def test_ilama_lora(ilama_lora_files):
             dtype="half",
             max_loras=4,
             max_model_len=1024,
+            cudagraph_capture_sizes=[1, 2, 4, 8],
             max_num_seqs=16,
     ) as vllm_model: