cherry-pick-7.5: br: restore checksum shouldn't rely on backup checksum (#56712)

[Tristan1900]

close #56373

(cherry picked from commit 4f047be)

What problem does this PR solve?

Issue Number: close #xxx

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.

The default behavior of doing checksum during full backup has changed from enabled to disabled. 
The meaning of checksum flag is kind of ambiguous here, it doesn't mean we don't do the checksum of files when doing backup, instead we don't do checksum to compare from coprocessor side to the br side to improve the performance

[ti-chi-bot]

This cherry pick PR is for a release branch and has not yet been approved by triage owners.
Adding the do-not-merge/cherry-pick-not-approved label.

To merge this cherry pick:

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[tiprow]

Hi @Tristan1900. Thanks for your PR.

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[codecov]

Codecov Report

Attention: Patch coverage is 23.52941% with 39 lines in your changes missing coverage. Please review.

Please upload report for BASE (release-7.5@085de3a). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-7.5     #58225   +/-   ##
================================================
  Coverage               ?   72.1260%           
================================================
  Files                  ?       1417           
  Lines                  ?     413347           
  Branches               ?          0           
================================================
  Hits                   ?     298131           
  Misses                 ?      95201           
  Partials               ?      20015           

Flag	Coverage Δ
unit	72.1260% <23.5294%> (?)

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	53.4912% <0.0000%> (?)

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: YuJuncen

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Needs approval from an approver in each of these files:

• OWNERS [YuJuncen]
• br/OWNERS [YuJuncen]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-12-13 03:38:23.103965916 +0000 UTC m=+582493.192768459: ☑️ agreed by YuJuncen.

[ti-chi-bot]

@Tristan1900: 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/check_dev_2	dd45a94	link	true	/test check-dev2

Full PR test history. Your PR dashboard.

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