Make block_size of BuildHistKernel adaptive #13735

Job	Run time
Build libxgboost4j.so targeting glibc 2.17 (arch aarch64, runner linux-arm64-cpu)	2m 19s
Build libxgboost4j.so with CUDA	8m 47s
Build libxgboost4j.dylib for MacOS (Intel)	4m 48s
Build and test JVM packages (Linux, Scala 2.13)	5m 44s
Build libxgboost4j.so targeting glibc 2.17 (arch x86_64, runner linux-amd64-cpu)	2m 16s
Build libxgboost4j.dylib for MacOS (Apple Silicon)	3m 5s
Build and test JVM packages (Linux, Scala 2.12)	10m 53s
Build and test JVM packages (macos-15-intel)	9m 33s
Build and test JVM packages (windows-latest)	9m 40s
Test JVM packages with CUDA (Scala 2.12)	8m 19s
Test JVM packages with CUDA (Scala 2.13)	8m 24s
Deploy JVM packages to S3 (gpu, Scala 2.12)	15s
Deploy JVM packages to S3 (gpu, Scala 2.13)	16s
Deploy JVM packages to S3 (cpu, Scala 2.12)	14s
Deploy JVM packages to S3 (cpu, Scala 2.13)	14s
	1h 14m 47s

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