mysql: wait the asynchronous ddl to synchronize

[wk989898]

What problem does this PR solve?

Issue Number: ref pingcap/tiflow#12123

What is changed and how it works?

Check List

Tests

• Unit test
• Integration test

Questions

Will it cause performance regression or break compatibility?

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

Release note

`None`.

[ti-chi-bot]

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[ti-chi-bot]

@wk989898: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-cdc-pulsar-integration-light	7491100	link	false	/test pull-cdc-pulsar-integration-light
pull-cdc-kafka-integration-light	7491100	link	false	/test pull-cdc-kafka-integration-light

Full PR test history. Your PR dashboard.

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[wk989898]

/test pull-cdc-mysql-integration-heavy

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hongyunyan

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-04-22 06:07:56.557313084 +0000 UTC m=+335820.369103467: ☑️ agreed by hongyunyan.