br/lightning: Apply pd_enable_follower_handle_region to Lightning/BR

[okJiang]

What problem does this PR solve?

Issue Number: close #58651

Problem Summary:

What changed and how does it work?

• Get pd_enable_follower_handle_region from TiDB and set it to pd client.

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

[codecov]

Codecov Report

Attention: Patch coverage is 45.23810% with 23 lines in your changes missing coverage. Please review.

Project coverage is 74.8761%. Comparing base (db15d43) to head (1a3418e).
Report is 23 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #59783        +/-   ##
================================================
+ Coverage   72.9550%   74.8761%   +1.9211%     
================================================
  Files          1699       1745        +46     
  Lines        469293     481396     +12103     
================================================
+ Hits         342373     360451     +18078     
+ Misses       105847      98216      -7631     
- Partials      21073      22729      +1656     

Flag	Coverage Δ
integration	49.1530% <47.5000%> (?)
unit	72.1289% <0.0000%> (-0.0183%)	⬇️

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

Components	Coverage Δ
dumpling	52.6910% <ø> (ø)
parser	∅ <ø> (∅)
br	61.7236% <53.8461%> (+16.6701%)	⬆️

[okJiang]

/test pull-br-integration-test

[tiprow]

@okJiang: The specified target(s) for /test were not found.
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/test pull-br-integration-test

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[okJiang]

/retest

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lance6716, YuJuncen

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:

• OWNERS [YuJuncen,lance6716]
• br/OWNERS [YuJuncen]
• lightning/OWNERS [lance6716]
• pkg/lightning/OWNERS [lance6716]

Approvers can indicate their approval by writing /approve in a comment
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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-02-27 07:33:53.915676015 +0000 UTC m=+513981.868834282: ☑️ agreed by YuJuncen.
• 2025-02-27 10:37:13.338091789 +0000 UTC m=+524981.291250055: ☑️ agreed by lance6716.

[okJiang]

/retest

[okJiang]

/retest

[okJiang]

/retest

[okJiang]

/retest