Optimization of PushRowPage for high number of cpu cores #14099

Job	Run time
Build CPU	14m 13s
Build CPU ARM64 + manylinux_2_28_aarch64 wheel	3m 13s
Build CUDA + manylinux_2_28_x86_64 wheel	10m 16s
Build CUDA with RMM	10m 34s
Build CUDA with RMM (dev)	10m 55s
Build manylinux2014_aarch64 wheel	2m 57s
Build manylinux2014_x86_64 wheel	3m 27s
Build GPU-enabled R package	13m 7s
Run Python tests (single-gpu)	6m 44s
Run Python tests (multiple-gpu)	38m 29s
Run Python tests (cpu-amd64)	18m 58s
Run Python tests (cpu-arm64)	1m 14s
Run Google Tests with GPUs (Suite gpu, Runner linux-amd64-gpu)	4m 12s
Run Google Tests with GPUs (Suite gpu-rmm, Runner linux-amd64-gpu)	4m 16s
Run Google Tests with GPUs (Suite mgpu, Runner linux-amd64-mgpu)	2m 35s
	2h 25m 10s

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