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ARROW-16912: [R][CI] Fix nightly centos package without GCS (#13441)

cc @assignUser 

Most of the diff seems to be my editor trimming whitespace. The actual changes:

* Rename `r-nightly-packages` to `r-binary-packages` since they can be run on demand (not only nightly)
* Add it to the `r` crossbow group
* Turn ARROW_GCS=OFF in the centos-7 package. Where this setting happens is not obvious.

Authored-by: Neal Richardson <neal.p.richardson@gmail.com>
Signed-off-by: Neal Richardson <neal.p.richardson@gmail.com>