fix: imprecise pulsar topic mapping due to parallelism

[tabVersion]

… integration test

I hereby agree to the terms of the RisingWave Labs, Inc. Contributor License Agreement.

solution comes from #23900

What's changed and what's your intention?

Checklist

• I have written necessary rustdoc comments.
• I have added necessary unit tests and integration tests.
• I have added test labels as necessary.
• I have added fuzzing tests or opened an issue to track them.
• My PR contains breaking changes.
• My PR changes performance-critical code, so I will run (micro) benchmarks and present the results.
• I have checked the Release Timeline and Currently Supported Versions to determine which release branches I need to cherry-pick this PR into.

Documentation

• My PR needs documentation updates.

Release note

[BugenZhao]

This has been fixed in #23900. Shall we cherry-pick?

[tabVersion]

@BugenZhao #23900 also contains other errors do not show in the failed main-cron. I did not track where the errors come from, so just fix as reports.