[Test] Add tests for the multi-node DeepSeek-V2-Lite network in GE Graph (#4039)

### What this PR does / why we need it?
Add tests for the multi-node DeepSeek-V2-Lite network in GE Graph mode,
and supplement the end-to-end (e2e) tests for the MLA and NZ features of
this network.
- vLLM version: v0.11.0
- vLLM main:
2918c1b49c

---------

Signed-off-by: CodeNine-CJ <chenjian343@huawei.com>

tests/e2e/multicard/test_torchair_graph_mode.py

@@ -288,3 +288,14 @@ def test_e2e_deepseekv2lite_with_torchair_v1scheduler():
     }
     _deepseek_v2_lite_torchair_test_fixure(additional_config,
                                            use_v1_schduler=True)
+
+
+# kv_cache enable e2e test
+def test_e2e_deepseekv2lite_with_nz():
+    additional_config = {
+        "torchair_graph_config": {
+            "enabled": True,
+            "enable_kv_nz": True,
+        },
+    }
+    _deepseek_v2_lite_torchair_test_fixure(additional_config)