Use cuda::stream_ref for pooled streams - #5639
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Updates pooled-stream call sites for the
cuda::stream_refreturned by RAFT after rapidsai/rmm#2372. This preserves the stream-ref type when selecting pooled or primary streams and uses.get()only at raw CUDA boundaries.Also updates the MTMG handle stream accessor to return
cuda::stream_ref.Depends on NVIDIA/raft#3129 and rapidsai/rmm#2372.