[BREAKING CHANGE]: change default backend to PyTorch in trtllm-serve#5717

LinPoly merged 4 commits intoNVIDIA:mainNVIDIA/TensorRT-LLM:mainfrom

LinPoly:user/pengyunl/pyt_default_serveLinPoly/TensorRT-LLM:user/pengyunl/pyt_default_serveCopy head branch name to clipboard