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ARROW-8606: [CI] Don't trigger all builds on a change to any file in ci/

If I edit an R build script, we shouldn't be running JS and Go builds.

Closes #7046 from nealrichardson/trigger-fewer

Authored-by: Neal Richardson <neal.p.richardson@gmail.com>
Signed-off-by: Wes McKinney <wesm+git@apache.org>