log backup: set a proper maxVersion to resolve lock (#57178)

[ti-chi-bot]

This is an automated cherry-pick of #57178

What problem does this PR solve?

Issue Number: close #57134

Problem Summary:

1. See issue.

What changed and how does it work?

To minimize the risk of lock conflicts, set the maxVersion to be the largest existing version value across all slow regions, incremented by 1. This adjustment helps optimize RPO by proactively reducing lock contention.

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

[BornChanger]

/retest

[wuhuizuo]

These lines need to be fixed.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: 3pointer, BornChanger

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-12-12 06:01:33.4935559 +0000 UTC m=+504683.582358442: ☑️ agreed by BornChanger.
• 2024-12-13 03:34:37.104228966 +0000 UTC m=+582267.193031508: ☑️ agreed by 3pointer.

[BornChanger]

/retest

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (release-7.5@7e13648). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-7.5     #57281   +/-   ##
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  Coverage               ?   72.1450%           
================================================
  Files                  ?       1417           
  Lines                  ?     413323           
  Branches               ?          0           
================================================
  Hits                   ?     298192           
  Misses                 ?      95136           
  Partials               ?      19995           

Flag	Coverage Δ
unit	72.1450% <100.0000%> (?)

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

Components	Coverage Δ
dumpling	52.9400% <0.0000%> (?)
parser	∅ <0.0000%> (?)
br	53.4868% <0.0000%> (?)

[ti-chi-bot]

@ti-chi-bot: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
idc-jenkins-ci-tidb/unit-test	d63db01	link	true	/test unit-test

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