coordinator: send checkpointTs message when changefeed state is finished#1039
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What problem does this PR solve?
Issue Number: ref #442
What is changed and how it works?
change changefeed state is ahead of sending checkpointTs message in the past. This makes no checkpointTs message if the state is finished.
Kafka consumer depends on checkpointTs messages to write previous DDL/DML events.
Check List
Tests
Questions
Will it cause performance regression or break compatibility?
Do you need to update user documentation, design documentation or monitoring documentation?
Release note