[P/D][main] Clean connector history information (#4650)

### What this PR does / why we need it?
Clean connector history information when the node restarts.

### Does this PR introduce _any_ user-facing change?
No

### How was this patch tested?
By ci

- vLLM version: v0.12.0
- vLLM main:
ad32e3e19c

---------

Signed-off-by: wangxiaoteng <wangxiaoteng@huawei.com>
Co-authored-by: wangxiyuan <wangxiyuan1007@gmail.com>

vllm_ascend/ascend_config.py

@@ -14,6 +14,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 from typing import Optional
+from uuid import uuid4
 
 from vllm.logger import logger
 
@@ -143,6 +144,11 @@ class AscendConfig:
             get_flashcomm2_oproj_tp_size_and_validate_config
         self.flashcomm2_oproj_tensor_parallel_size = get_flashcomm2_oproj_tp_size_and_validate_config(
             self, vllm_config)
+        kv_cfg = vllm_config.kv_transfer_config
+        if kv_cfg is not None and not getattr(kv_cfg, "_engine_id_patched",
+                                              False):
+            kv_cfg.engine_id = f"{kv_cfg.engine_id}-{uuid4().hex}"
+            kv_cfg._engine_id_patched = True
 
 
 class AscendCompilationConfig: