[Bugfix]fix the thread lock when user input same id

[GGBond8488]

deploy with the IFB, when user input the paylod as follow:

    {
        "text_input": str(question),
        "max_tokens": 512,
        "bad_words": "",
        "stop_words": stop_words,
        "pad_id": pad_id,
        "end_id": end_id,
        "top_p": 1,
        "id": "ggbond_test",
        "temperature": 0.0000001
    }

if every pyload‘s id is same, will cause the error:

Exception in thread Thread-1 (awaiter_loop):
Traceback (most recent call last):
File "/usr/lib/python3.10/threading.py", line 1016, in _bootstrap_inner
self.run()
self._target(*self._args, **self._kwargs)
File "/code/model_pipeline_name/tensorrt_llm/1/model.py", line 920, in awaiter_loop
del self.triton_user_id_to_req_ids[
KeyError: 'ggbond_test'