When finalizing a transaction, we always schedule replication jobs in
case the primary has returned an error. Given that there are many RPCs
which are expected to return errors in a controlled way, e.g. if a
commit is missing, this causes us to create replication in many contexts
where it's not necessary at all.

Thinking about the issue, what we really care for is not whether an RPC
failed or not. It's that primary and secondary nodes behaved the same.
If both primary and secondaries succeeded, we're good. But if both
failed with the same error, then we're good to as long as all
transactions have been committed: quorum was reached on all votes and
nodes failed in the same way, so we can assume that nodes did indeed
perform the same changes.

This commit thus relaxes the error condition to not schedule replication
jobs anymore in case the primary failed, but to only schedule
replication jobs to any node which has a different error than the
primary. This has both the advantage that we only need to selectively
schedule jobs for disagreeing nodes instead of targeting all
secondaries and it avoids scheduling jobs in many cases where we do hit
errors.

Changelog: performance