[https://nvbugs/5537738][fix] Add fp8 post-quant allgather support#8008

ChristinaZ merged 1 commit intoNVIDIA:mainNVIDIA/TensorRT-LLM:mainfrom

ChristinaZ:fix_fp8_allgatherChristinaZ/TensorRT-LLM:fix_fp8_allgatherCopy head branch name to clipboard