[R] Replace vignettes and examples #11642

Job	Run time
Build libxgboost4j.so targeting glibc 2.17 (arch aarch64, runner linux-arm64-cpu)	1m 40s
Build libxgboost4j.so targeting glibc 2.17 (arch x86_64, runner linux-amd64-cpu)	1m 48s
Build libxgboost4j.so with CUDA	5m 51s
Build libxgboost4j.dylib for MacOS (Apple Silicon)	1m 33s
Build and test JVM packages (Linux, Scala 2.12)	9m 49s
Build and test JVM packages (windows-latest)	8m 7s
Build libxgboost4j.dylib for MacOS (Intel)	7m 28s
Build and test JVM packages (Linux, Scala 2.13)	5m 20s
Build and test JVM packages (macos-13)	9m 45s
Test JVM packages with CUDA (Scala 2.12)	5m 58s
Test JVM packages with CUDA (Scala 2.13)	6m 4s
Build docs for JVM packages	4m 52s
Deploy JVM packages to S3 (cpu)	8s
Deploy JVM packages to S3 (cpu)	7s
Deploy JVM packages to S3 (gpu)	9s
Deploy JVM packages to S3 (gpu)	9s
	1h 8m 48s

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