chore: trying atomics and tree reduction for CUDA reducer kernels (#3… #5098

Job	Run time
Build Python	15s
Build C++ x86	52s
Determine Pyodide Python version	7s
Build C++ WASM	31s
Execute cppyy notebook	1m 41s
Build Docs	4m 37s
Deploy	19s
Deploy Branch Preview	0s
	8m 22s

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