test: verify default timestamp test with pool fix

[hongyunyan]

What problem does this PR solve?

Issue Number: ref #5335, ref #5397

This is a CI-only validation PR. PR #5335 adds coverage for replicating DDL default current timestamp behavior, and PR #5397 fixes MySQL sink connection-pool ownership around DML and control database access. This PR combines both heads so GitHub CI can validate the new #5335 tests with the #5397 fix applied.

What is changed and how it works?

This branch is based on the latest head of #5335 and merges the latest head of #5397. It does not introduce additional implementation changes beyond those two PRs.

Check List

Tests

• Unit test
• Integration test
• Manual test: not run locally for this validation PR; this PR is opened to let GitHub CI run the combined change set.

Questions

Will it cause performance regression or break compatibility?

No. This is a validation PR that only combines #5335 and #5397 for CI.

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

No.

Release note

None.

[ti-chi-bot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[ti-chi-bot]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

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Run ID: d2a312e0-4201-4d67-afc1-7fd08835a903

📥 Commits

Reviewing files that changed from the base of the PR and between fc24e66 and a1f0a2f.

📒 Files selected for processing (8)

• downstreamadapter/sink/mysql/sink.go
• downstreamadapter/sink/mysql/sink_test.go
• downstreamadapter/sink/pulsar/sink.go
• pkg/applier/redo.go
• pkg/applier/redo_test.go
• pkg/sink/mysql/config.go
• pkg/sink/mysql/config_test.go
• tests/integration_tests/run_light_it_in_ci.sh

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[hongyunyan]

/test pull-cdc-mysql-integration-light

[ti-chi-bot]

@hongyunyan: The following test 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-mysql-integration-light	a1f0a2f	link	true	/test pull-cdc-mysql-integration-light

Full PR test history. Your PR dashboard.

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