sink(ticdc): store checkpointTs by flushedResolvedTsMap in mysql sink (#5418)

[ti-chi-bot]

This is an automated cherry-pick of #5418

What problem does this PR solve?

Issue Number: close #5107

What is changed and how it works?

• When mysql Sink traverses thetableMaxResolvedTs at this line, the map may have been concurrently modified, which will result in an incorrect value being saved totableCheckpointTs .
  To solve this problem, we need to:

  1. Save the resolvedTs, which are used to search data from txnCache, into the flushedResolvedTsMap
  2. In mysql sink, always store checkpointTs based on flushedResolvedTsMap

• Replace resolvedNotifier with resolvedCh to simplify the code

Check List

Tests

• Unit test

Related changes

• Need to cherry-pick to the release branch

Release note

`Fix a bug that mysql sink may save a wrong checkpointTs`.

[ti-chi-bot]

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[CharlesCheung96]

/run-all-tests

[CharlesCheung96]

/run-kafka-integration-test

[asddongmen]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 6286415

[CharlesCheung96]

/run-kafka-integration-test
/run-unit-test