[1/N][CI] Add multi node test (#3359)

### What this PR does / why we need it?
This pr purpose to add multi-node test, on the first step, add
`deepseek-v3` dp+tp+ep test
### Does this PR introduce _any_ user-facing change?

### How was this patch tested?

- vLLM version: v0.11.0rc3
- vLLM main: https://github.com/vllm-project/vllm/commit/v0.11.0

---------

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

tests/e2e/multi_node/config/config.json

@@ -0,0 +1,41 @@
+[
+    {
+        "test_name": "test_deepseek_v3",
+        "disaggregate_prefill": false,
+        "enable_multithread_load": false,
+        "num_nodes": 2,
+        "server_parameters": {
+            "leader_config": {
+                "model": "vllm-ascend/DeepSeek-V3-W8A8",
+                "additional_config": {
+                    "ascend_scheduler_config": {
+                        "enabled": true
+                    },
+                    "torchair_graph_config": {
+                        "enabled": true
+                    }
+                }
+            },
+            "worker_config": {
+                "model": "vllm-ascend/DeepSeek-V3-W8A8",
+                "additional_config": {
+                    "ascend_scheduler_config": {
+                        "enabled": true
+                    },
+                    "torchair_graph_config": {
+                        "enabled": true
+                    }
+                }
+            }
+        },
+        "client_parameters": {
+            "model": "vllm-ascend/DeepSeek-V3-W8A8",
+            "backend": "vllm",
+            "dataset_name": "sharegpt",
+            "dataset_path": "/root/.cache/datasets/ShareGPT_V3_unfiltered_cleaned_split.json",
+            "num_prompts": 200,
+            "request_rate": 1
+        },
+        "accuracy_parameters": {}
+    }
+]