[R-package] standardize naming of internal functions #7537

Job	Run time
r-package (debian, R-devel, clang)	13m 30s
r-package (ubuntu-latest, gcc, R 3.6, cmake)	8m 43s
r-sanitizers (ubuntu-latest, R-devel, gcc ASAN/UBSAN)	22m 47s
r-package (ubuntu-latest, gcc, R 4.3, cmake)	9m 37s
r-sanitizers (ubuntu-latest, R-devel, clang ASAN/UBSAN)	35m 34s
r-package (ubuntu-latest, clang, R 3.6, cmake)	9m 47s
r-package (ubuntu-latest, clang, R 4.3, cmake)	9m 52s
r-package (macOS-latest, gcc, R 4.3, cmake)	16m 23s
r-package (macOS-latest, clang, R 4.3, cmake)	8m 57s
r-package (windows-latest, MINGW, R 3.6, cmake)	16m 55s
r-package (windows-latest, MINGW, R 4.3, cmake)	17m 8s
r-package (windows-2019, MSVC, R 3.6, cmake)	17m 2s
r-package (windows-2022, MSVC, R 4.3, cmake)	20m 9s
r-package (windows-latest, MINGW, R 3.6, cran)	26m 26s
r-package (windows-latest, MINGW, R 4.3, cran)	21m 31s
r-package (ubuntu-latest, gcc, R 4.3, cran)	24m 12s
r-package (macOS-latest, clang, R 4.3, cran)	18m 52s
r-rchk (ubuntu-latest, gcc, R 4.3, cran)	9m 55s
all-r-package-jobs-successful	8s
	5h 7m 28s

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