Re-enable tests for Arrow substrait compiler

[paleolimbot]

After #181 almost all ProjectRel plans fail with the Arrow compiler because the Emit clause isn't implemented. The PR enabling this is on the way ( apache/arrow#13914 ), but until it's merged we have too many test failures (because use select() all over the place). I tried to do this in such a way that there are test skip() and warning() wherever this happens and it shows up on the output of devtools::test(). The one place where this does not show up is the R-CMD-Check action (which commented out a bunch of arrow stuff since we don't need to build the custom version until it is reenabled in the tests).