[CI] Accuracy issue of qwen3-next-w8a8 nightly test fix. (#5746)

### What this PR does / why we need it?
Close the **Full Graph** mode to temporarily avoid accuracy issue for
**Qwen3-Next-80B-A3B-Instruct-W8A8**.
### Does this PR introduce _any_ user-facing change?
N/A
### How was this patch tested?

- vLLM version: v0.13.0
- vLLM main:
2f4e6548ef

---------

Signed-off-by: InSec <1790766300@qq.com>

tests/e2e/nightly/single_node/models/test_qwen3_next_w8a8.py

@@ -78,7 +78,7 @@ async def test_models(model: str) -> None:
         "--gpu-memory-utilization",
         "0.65",
         "--compilation-config",
-        '{"cudagraph_capture_sizes": [32], "cudagraph_mode":"FULL_DECODE_ONLY"}',
+        '{"cudagraph_capture_sizes": [32]}',
     ]
     request_keyword_args: dict[str, Any] = {
         **api_keyword_args,