Bump TensorRT-LLM backend dependency to v0.16.0 (#2931)
* backend(trtllm): update to 0.16.0
* backend(trtllm): do not use shallow clone
* backend(trtllm): use tag instead
* backend(trtllm): move to nvidia remote instead of hf
* backend(trtllm): reenable shallow clone
* backend(trtllm): attempt to use ADD instead of RUN for openmpi
* backend(trtllm): make sure we are using correct path for openmpi ADD in dockerfile
* backend(trtllm): add correctly untar it