Make block_size of BuildHistKernel adaptive #13746

Job	Run time
Build libxgboost4j.so targeting glibc 2.17 (arch aarch64, runner linux-arm64-cpu)	2m 20s
Build libxgboost4j.so with CUDA	7m 41s
Build libxgboost4j.dylib for MacOS (Apple Silicon)	2m 37s
Build and test JVM packages (Linux, Scala 2.13)	5m 22s
Build and test JVM packages (Linux, Scala 2.12)	10m 50s
Build and test JVM packages (macos-15-intel)	10m 6s
Build and test JVM packages (windows-latest)	7m 47s
Build libxgboost4j.so targeting glibc 2.17 (arch x86_64, runner linux-amd64-cpu)	1m 48s
Build libxgboost4j.dylib for MacOS (Intel)	5m 32s
Test JVM packages with CUDA (Scala 2.12)	8m 20s
Test JVM packages with CUDA (Scala 2.13)	8m 29s
Deploy JVM packages to S3 (gpu, Scala 2.13)	17s
Deploy JVM packages to S3 (gpu, Scala 2.12)	16s
Deploy JVM packages to S3 (cpu, Scala 2.12)	14s
Deploy JVM packages to S3 (cpu, Scala 2.13)	13s
	1h 11m 52s

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