br: refactor test to use wait checkpoint method

[Tristan1900]

What problem does this PR solve?

Issue Number: close #57609

Problem Summary:

What changed and how does it work?

Extract the wait for checkpoint to advance logic in integration test to a method

Check List

Tests

• [ ] Unit test
• [x] Integration test
• [ ] Manual test (add detailed scripts or steps below)
• [ ] No need to test

  • [ ] I checked and no code files have been changed.

Side effects

• [ ] Performance regression: Consumes more CPU
• [ ] Performance regression: Consumes more Memory
• [ ] Breaking backward compatibility

Documentation

• [ ] Affects user behaviors
• [ ] Contains syntax changes
• [ ] Contains variable changes
• [ ] Contains experimental features
• [ ] Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[tiprow[bot]]

Hi @Tristan1900. Thanks for your PR.

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[Tristan1900]

/ok-to-test

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 74.3187%. Comparing base (49c3eba) to head (b44989e). Report is 177 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #57612 +/- ## ================================================ + Coverage 73.2689% 74.3187% +1.0498% ================================================ Files 1650 1691 +41 Lines 455646 489758 +34112 ================================================ + Hits 333847 363982 +30135 - Misses 101279 103622 +2343 - Partials 20520 22154 +1634 ``` | [Flag](https://app.codecov.io/gh/pingcap/tidb/pull/57612/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | Coverage Δ | | |---|---|---| | [integration](https://app.codecov.io/gh/pingcap/tidb/pull/57612/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | `46.5437% <ø> (?)` | | | [unit](https://app.codecov.io/gh/pingcap/tidb/pull/57612/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | `72.1942% <ø> (-0.3651%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap#carryforward-flags-in-the-pull-request-comment) to find out more. | [Components](https://app.codecov.io/gh/pingcap/tidb/pull/57612/components?src=pr&el=components&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | Coverage Δ | | |---|---|---| | [dumpling](https://app.codecov.io/gh/pingcap/tidb/pull/57612/components?src=pr&el=component&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | `52.7673% <ø> (-0.1806%)` | :arrow_down: | | [parser](https://app.codecov.io/gh/pingcap/tidb/pull/57612/components?src=pr&el=component&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | `∅ <ø> (∅)` | | | [br](https://app.codecov.io/gh/pingcap/tidb/pull/57612/components?src=pr&el=component&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | `58.0080% <ø> (+12.0074%)` | :arrow_up: |

---

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[Tristan1900]

/retest

[tiprow[bot]]

@Tristan1900: 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
fast_test_tiprow	b44989e8d1eaf69c330cc20caa6ad3b850d8fced	link	true	/test fast_test_tiprow
tidb_parser_test	b44989e8d1eaf69c330cc20caa6ad3b850d8fced	link	true	/test tidb_parser_test

Full PR test history. Your PR dashboard.

Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes-sigs/prow](https://github.com/kubernetes-sigs/prow/issues/new?title=Prow%20issue:) repository. I understand the commands that are listed [here](https://go.k8s.io/bot-commands).