br: fix pitr system table inconsistency issue (#60202)

[ti-chi-bot]

This is an automated cherry-pick of #60202

What problem does this PR solve?

Issue Number: close #60201

Problem Summary:

What changed and how does it work?

Prevent pitr to restore system table change during log backup,
only restore full snapshot to be consistent with previous version

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

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (release-9.0-beta.1@a5ca5f3). Learn more about missing BASE report.

Additional details and impacted files

@@                   Coverage Diff                   @@
##             release-9.0-beta.1     #60210   +/-   ##
=======================================================
  Coverage                      ?   74.6572%           
=======================================================
  Files                         ?       1718           
  Lines                         ?     470327           
  Branches                      ?          0           
=======================================================
  Hits                          ?     351133           
  Misses                        ?      97310           
  Partials                      ?      21884           

Flag	Coverage Δ
integration	46.1436% <100.0000%> (?)
unit	72.3091% <12.5000%> (?)

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

Components	Coverage Δ
dumpling	52.6910% <0.0000%> (?)
parser	∅ <0.0000%> (?)
br	62.3045% <0.0000%> (?)

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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Needs approval from an approver in each of these files:

• br/OWNERS [BornChanger,Leavrth]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-03-21 09:28:27.059897236 +0000 UTC m=+607000.744133332: ☑️ agreed by BornChanger.
• 2025-03-21 09:42:23.885621224 +0000 UTC m=+607837.569857321: ☑️ agreed by Leavrth.

[Leavrth]

/retest