delete and update events may not be correctly sinked to downstream

[zhaoxinyu]

What did you do?

1. run csv_storage_basic test

CASE="csv_storage_basic" docker-compose -f ./deployments/ticdc/docker-compose/docker-compose-storage-integration.yml up

2. run sync_diff_inspector to check difference between upstream and downstream.

What did you expect to see?

All dml events can be sinked correctly.

What did you see instead?

Delete and update events are not sinked properly.

Versions of the cluster

TiCDC version (execute cdc version):

v6.7.0-master