use offline by default with cargo fmt
with online fallback
#3830
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Refs #3811, #3813, and #3831
There was discussion on #3811 with concerns raised that the solution in #3813 (keep the default
online
just like current/existing behavior, with anoffline
fallback) doesn't fully solve the problem, so opening this for consideration as an alternative (a mutually exclusive alternative to #3831)