[R-package] Add missed packages into dependencies list

[StrikerRUS]

Install RhpcBLASctl during docs check.

Match list of dependencies in README with one really used in the corresponding CI jobs.
ASAN/UBSAN:

LightGBM/.github/workflows/r_package.yml

Line 191 in 248fbfa

RDscript${{ matrix.r_customization }} -e "install.packages(c('R6', 'data.table', 'jsonlite', 'knitr', 'Matrix', 'RhpcBLASctl', 'rmarkdown', 'testthat'), repos = 'https://cran.r-project.org', Ncpus = parallel::detectCores())"

Valgrind:

LightGBM/.ci/test_r_package_valgrind.sh

Line 3 in 248fbfa

RDscriptvalgrind -e "install.packages(c('R6', 'data.table', 'jsonlite', 'knitr', 'Matrix', 'RhpcBLASctl', 'rmarkdown', 'testthat'), repos = 'https://cran.r-project.org', Ncpus = parallel::detectCores())" || exit -1

[jameslamb]

ah! I forgot these install.packages() are also documented in the README. Sorry for not catching that in #4972.

[github-actions]

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