barrier(ticdc): fix wrong barrier ts under frequent ddl scenario (#10669)

[ti-chi-bot]

This is an automated cherry-pick of #10669

What problem does this PR solve?

Issue Number: close #10668

What is changed and how it works?

The problem detail is described in #10668.

The same physical table may have multiple related ddl events when calculating barrier.
Previous, we choose the commitTs of the last ddl met as the barrierTs for the table.
This may cause the barrierTs of some tables advanced more than expected.

In this pr, we changed to choose the min commitTs of all ddls related to the same physical table as the barrierTs.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Questions

Will it cause performance regression or break compatibility?

Do you need to update user documentation, design documentation or monitoring documentation?

Release note

Fix wrong barrier ts under frequent ddl scenario.

[lidezhu]

/test pull-cdc-integration-storage-test

[ti-chi-bot]

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[lidezhu]

/test cdc-integration-storage-test

[ti-chi-bot]

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This pull-request has been approved by: CharlesCheung96

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[lidezhu]

/test cdc-integration-mysql-test