br: set default restore checksum to false

[Tristan1900]

What problem does this PR solve?

Issue Number: close #60329

Problem Summary:

What changed and how does it work?

Turn off both backup and restore checksum by default
Default turned on by int test

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.

We previously turned off backup checksum by default and this PR turns off restore checksum by default as well as we think it's resource intensive in production. User can still turn it on by enabling the flag explicitly. 

[tiprow]

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[codecov]

Codecov Report

Attention: Patch coverage is 60.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 76.2819%. Comparing base (9518131) to head (f6d0131).
Report is 65 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #60328        +/-   ##
================================================
+ Coverage   73.1030%   76.2819%   +3.1788%     
================================================
  Files          1710       1730        +20     
  Lines        472551     490537     +17986     
================================================
+ Hits         345449     374191     +28742     
+ Misses       105816      94831     -10985     
- Partials      21286      21515       +229     

Flag	Coverage Δ
integration	47.8251% <40.0000%> (?)
unit	74.0375% <60.0000%> (+1.7373%)	⬆️

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

Components	Coverage Δ
dumpling	54.8593% <ø> (+2.1683%)	⬆️
parser	∅ <ø> (∅)
br	62.6178% <50.0000%> (+15.3837%)	⬆️

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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Needs approval from an approver in each of these files:

• OWNERS [Leavrth,YuJuncen]
• br/OWNERS [Leavrth,YuJuncen]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-04-02 02:03:07.932610872 +0000 UTC m=+1617081.616846963: ☑️ agreed by Leavrth.
• 2025-04-11 03:40:46.836034019 +0000 UTC m=+2400540.520270115: ☑️ agreed by YuJuncen.