After adding ranges for sandbox versions, this PR now also adds ranges
for test tool versions. This is particularly useful since this gets us
to the point where adding a new version usually (unless we’ve actually
broken compatibility more than before) does not require any change in
exclusions.

I’ve also cleaned up exclusions that only affect snapshots. While I’ve
previously argued against that since that seemed more annoying to
maintain, the list is small enough now that I’m no longer worried
about that.

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• Normal production system change, include purpose of change in description

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