[dart/fuzzer] Minor output tweaks
Rationale:
(1) does not print output difference on clusters
to avoid cluttering logs (difference can be
reproduced locally anyway after the fact)
(2) prints total # divergences at end in summary
Change-Id: I6fb736178569bfc0fa41afc525dee8f76ea7b465
Reviewed-on: https://dart-review.googlesource.com/c/78581
Reviewed-by: Alexander Thomas <athom@google.com>
Commit-Queue: Aart Bik <ajcbik@google.com>
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