Complete listener on rejection in FollowersChecker #86259
Merged
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In #83576 we made it so that forking off the transport thread when
handling a follower check might be rejected if we're shutting down. In
that case we don't pass the rejection exception back out and instead
rely on the transport connection's close to notify the caller. We also
manipulate the transport channel directly which misses some exception
cases. This commit adjusts the implementation to fix these things.