[bug] txn client: fix hang issue. #12777
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What type of PR is this?
Which issue(s) this PR fixes:
issue https://github.com/matrixorigin/MO-Cloud/issues/1733
What this PR does / why we need it:
some sequence bug results to the hang issue, fix:
set the cancel channel to nil in timestamp waiter. If some new txns
comes, refuse its creation because the channel is nil. After rollback
all txns, resume the timestamp waiter and create a new cancel channel.