[R] Replace vignettes and examples #11685

Job	Run time
Build libxgboost4j.so with CUDA	6m 8s
Build libxgboost4j.dylib for MacOS (Apple Silicon)	1m 57s
Build libxgboost4j.dylib for MacOS (Intel)	6m 10s
Build libxgboost4j.so targeting glibc 2.17 (arch aarch64, runner linux-arm64-cpu)	2m 9s
Build libxgboost4j.so targeting glibc 2.17 (arch x86_64, runner linux-amd64-cpu)	1m 56s
Build and test JVM packages (Linux, Scala 2.12)	10m 12s
Build and test JVM packages (windows-latest)	11m 29s
Build and test JVM packages (Linux, Scala 2.13)	5m 14s
Build and test JVM packages (macos-13)	13m 2s
Build docs for JVM packages	4m 46s
Test JVM packages with CUDA (Scala 2.12)	6m 18s
Test JVM packages with CUDA (Scala 2.13)	6m 13s
Deploy JVM packages to S3 (cpu)	6s
Deploy JVM packages to S3 (cpu)	9s
Deploy JVM packages to S3 (gpu)	10s
Deploy JVM packages to S3 (gpu)	8s
	1h 16m 7s

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