[CI]refactor: standardize test case naming convention (#5243)

### What this PR does / why we need it?
- Standardize test case naming in `vllm-ascend/tests/e2e/multicard/` to
follow the `<model>_<feature>_<distributed>` convention.

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

---------

Signed-off-by: MrZ20 <2609716663@qq.com>
Signed-off-by: root <root@LAPTOP-VQKDDVMG.localdomain>
Co-authored-by: root <root@LAPTOP-VQKDDVMG.localdomain>

tests/e2e/multicard/test_offline_weight_load.py

@@ -31,7 +31,7 @@ MODELS = ["Qwen/Qwen3-30B-A3B"]
 
 @pytest.mark.parametrize("model", MODELS)
 @patch.dict(os.environ, {"VLLM_ASCEND_ENABLE_NZ": "0"})
-def test_qwen_offline_weight_load_and_sleepmode(model):
+def test_qwen3_offline_load_and_sleepmode_tp2(model):
     script = Path(
         __file__
     ).parent.parent.parent.parent / "examples" / "offline_external_launcher.py"