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ci/github-script/reviews: rework dismissal/non-posting logic
Dismissals are done automatically by commits.js, even for reviews from
check-target-branches.js. This is not desirable.
The solution is
(1) do not decline to post a review because it was already dismissed
(because it may have not been dismissed by a human, and circumstances may
have changed), and
(2) reword the auto-dismissal message to not imply that whatever
problems were present are fixed.