[R-package] standardize naming of internal functions #7570

Job	Run time
r-package (debian, R-devel, clang)	13m 12s
r-package (ubuntu-latest, gcc, R 3.6, cmake)	11m 4s
r-package (ubuntu-latest, gcc, R 4.3, cmake)	16m 25s
r-sanitizers (ubuntu-latest, R-devel, gcc ASAN/UBSAN)	14m 51s
r-package (ubuntu-latest, clang, R 3.6, cmake)	16m 18s
r-sanitizers (ubuntu-latest, R-devel, clang ASAN/UBSAN)	31m 30s
r-package (ubuntu-latest, clang, R 4.3, cmake)	13m 12s
r-package (macOS-latest, gcc, R 4.3, cmake)	11m 53s
r-package (macOS-latest, clang, R 4.3, cmake)	12m 38s
r-package (windows-latest, MINGW, R 3.6, cmake)	19m 18s
r-package (windows-latest, MINGW, R 4.3, cmake)	29m 10s
r-package (windows-2019, MSVC, R 3.6, cmake)	9m 15s
r-package (windows-2022, MSVC, R 4.3, cmake)	11m 17s
r-package (windows-latest, MINGW, R 3.6, cran)	32m 42s
r-package (windows-latest, MINGW, R 4.3, cran)	31m 56s
r-package (ubuntu-latest, gcc, R 4.3, cran)	20m 47s
r-package (macOS-latest, clang, R 4.3, cran)	18m 23s
r-rchk (ubuntu-latest, gcc, R 4.3, cran)	10m 34s
all-r-package-jobs-successful	3s
	5h 24m 28s

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