chore: Configure the RStudio IDE to use the extra roclets #4373

Job	Run time
Build source R package	6m 59s
Check windows-latest (release)	12m 37s
Check ubuntu-20.04 (release)	6m 26s
Coverage	54m 1s
Sanitizer	28m 7s
Check ubuntu-20.04 (oldrel-1)	7m 5s
Check ubuntu-20.04 (oldrel-2)	7m 23s
Check ubuntu-20.04 (oldrel-3)	7m 0s
Check ubuntu-20.04 (oldrel-4)	6m 46s
	2h 16m 24s

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