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ARROW-14237: [R] [CI] Disable altrep in R <= 3.5

Added a new helper function to skip tests on particular R versions

Closes #11404 from thisisnic/ARROW-14237_altrep

Lead-authored-by: Jonathan Keane <jkeane@gmail.com>
Co-authored-by: Nic Crane <thisisnic@gmail.com>
Signed-off-by: Jonathan Keane <jkeane@gmail.com>