### What this PR does / why we need it?
Fix layerwise Connector P/D request_id error, due to vllm pr:
https://github.com/vllm-project/vllm/pull/27987, which will add a random
suffix to request_id in EngineCore.
- vLLM version: v0.14.1
- vLLM main:
dc917cceb8
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Signed-off-by: nwpu-zxr <zhouxuerong2@huawei.com>