[CI] Drop outdated cases (#5709)

### What this PR does / why we need it?
Correcting some outdated use cases:
`tests/e2e/singlecard/test_aclgraph_accuracy.py::test_models_output` ->
`tests/e2e/singlecard/test_aclgraph_accuracy.py::test_piecewise_res_consistency`
### Does this PR introduce _any_ user-facing change?

### How was this patch tested?

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

Signed-off-by: wangli <wangli858794774@gmail.com>

.github/workflows/_e2e_test.yaml

@@ -83,7 +83,7 @@ jobs:
           VLLM_WORKER_MULTIPROC_METHOD: spawn
         if: ${{ inputs.type == 'light' }}
         run: |
-          pytest -sv --durations=0 tests/e2e/singlecard/test_aclgraph_accuracy.py::test_models_output
+          pytest -sv --durations=0 tests/e2e/singlecard/test_aclgraph_accuracy.py::test_piecewise_res_consistency
           pytest -sv --durations=0 tests/e2e/singlecard/test_quantization.py::test_qwen3_w8a8_quant
 
       - name: Run e2e test