br: revise tidb-lightning.toml for conflict detection

[lyzx2001]

What problem does this PR solve?

Issue Number: ref #51036

Problem Summary:

What changed and how does it work?

Check List

Tests

• Unit test
• 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

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[tiprow]

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[codecov]

Codecov Report

Merging #52025 (62e0711) into master (b9d83d3) will decrease coverage by 15.7047%.
The diff coverage is n/a.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #52025         +/-   ##
=================================================
- Coverage   70.6230%   54.9183%   -15.7047%     
=================================================
  Files          1481       1587        +106     
  Lines        439198     604519     +165321     
=================================================
+ Hits         310175     331992      +21817     
- Misses       109459     249393     +139934     
- Partials      19564      23134       +3570     

Flag	Coverage Δ
integration	36.4951% <ø> (?)
unit	70.4184% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
dumpling	53.9957% <ø> (ø)
parser	∅ <ø> (∅)
br	51.2139% <ø> (+5.3992%)	⬆️