ARROW-17252: [R] Intermittent valgrind failure#13773

Merged

nealrichardson merged 8 commits intoapache:masterfrom

paleolimbot:r-valgrind-2

Aug 9, 2022

Commits on Aug 7, 2022

more explicit and more correct cleaning up of env var
paleolimbot
committed
more reliable unsetting of environment variable, remove references to previous function name
paleolimbot
committed