lightning: remove some `NOT NULL` constraints on lightning table (#57577)

[ti-chi-bot]

This is an automated cherry-pick of #57577

What problem does this PR solve?

Issue Number: close #57578

Problem Summary:

What changed and how does it work?

https://github.com/pingcap/tidb/pull/55477 change the behavior of null value insert. To adapt to this change, some NOT NULL constraints have to be removed.

Previous PR just wrongly change INSERT INTO to INSERT IGNORE INTO, which may case data correctness.

Check List

Tests

• [ ] Unit test
• [ ] Integration test
• [ ] Manual test (add detailed scripts or steps below)
• [X] 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

[codecov[bot]]

Codecov Report

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

Please upload report for BASE (release-8.5@6404c67). Learn more about missing BASE report.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## release-8.5 #57600 +/- ## ================================================ Coverage ? 57.1101% ================================================ Files ? 1770 Lines ? 628221 Branches ? 0 ================================================ Hits ? 358778 Misses ? 245502 Partials ? 23941 ``` | [Flag](https://app.codecov.io/gh/pingcap/tidb/pull/57600/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/57600/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | `37.0904% <ø> (?)` | | | [unit](https://app.codecov.io/gh/pingcap/tidb/pull/57600/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | `72.7956% <ø> (?)` | | 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/57600/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/57600/components?src=pr&el=component&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | `52.9478% <0.0000%> (?)` | | | [parser](https://app.codecov.io/gh/pingcap/tidb/pull/57600/components?src=pr&el=component&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | `∅ <0.0000%> (?)` | | | [br](https://app.codecov.io/gh/pingcap/tidb/pull/57600/components?src=pr&el=component&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | `52.3192% <0.0000%> (?)` | |

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[ti-chi-bot[bot]]

[LGTM Timeline notifier]

Timeline:

• 2024-11-21 11:12:13.41638341 +0000 UTC m=+116521.036037926: :ballot_box_with_check: agreed by fzzf678.
• 2024-11-22 01:25:24.651497065 +0000 UTC m=+167712.271151581: :ballot_box_with_check: agreed by lance6716.

[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Benjamin2037, fzzf678, lance6716

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files: - ~~[pkg/lightning/OWNERS](https://github.com/pingcap/tidb/blob/release-8.5/pkg/lightning/OWNERS)~~ [Benjamin2037,lance6716] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment