[R] Avoid warnings and prints during tests #11076
Merged
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#9810
As a follow up from #11072 and #11074
(requires those two PRs merged)
This PR avoids producing prints from either stdout or stderr during tests, which make them slower and make it harder to find where something goes wrong when failures happen.
Dependent on #11073 being merged and #11075 being fixed to silence everything currently in the tests.