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ARROW-7530: [Developer] Do not include list of PR commits in commit message when using PR merge tool

We've been including these since the beginning of the project, but my sense from reading commit logs is that they add noise and little extra information to our commit log. Since the commit message links back to the original PR, if someone is interested in looking at the evolution of a PR, they can look at the PR in the GitHub UI.

I got this from Apache Spark originally (IIRC) and Spark has also stopped including the commit messages in their merges.

Closes #6565 from wesm/ARROW-7530 and squashes the following commits:

60020d1ca <Wes McKinney> Do not include list of commits in PR message when merging

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