br: deliver "compact logbackup" to release-8.5

[YuJuncen]

What problem does this PR solve?

Issue Number: Ref #64814

Problem Summary:
See the issue.

What changed and how does it work?

This pr picked the codes that allow BR to restore a compacted backup.

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

[tiprow]

Hi @YuJuncen. Thanks for your PR.

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[codecov]

Codecov Report

❌ Patch coverage is 55.26820% with 1401 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (release-8.5@6ee10b2). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-8.5     #64850   +/-   ##
================================================
  Coverage               ?   77.0299%           
================================================
  Files                  ?       1665           
  Lines                  ?     461205           
  Branches               ?          0           
================================================
  Hits                   ?     355266           
  Misses                 ?      84173           
  Partials               ?      21766           

Flag	Coverage Δ
integration	50.4066% <32.0242%> (?)
unit	72.3968% <42.6564%> (?)

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

Components	Coverage Δ
dumpling	52.9278% <0.0000%> (?)
parser	∅ <0.0000%> (?)
br	62.3254% <0.0000%> (?)

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[YuJuncen]

/test unit-test

[tiprow]

@YuJuncen: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/test unit-test

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [3pointer,Leavrth]
• br/OWNERS [3pointer,Leavrth]
• br/pkg/storage/OWNERS [3pointer,Leavrth]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-12-08 06:07:43.178899397 +0000 UTC m=+848407.992676969: ☑️ agreed by Leavrth.
• 2025-12-08 09:12:10.966353388 +0000 UTC m=+859475.780130960: ☑️ agreed by 3pointer.

[YuJuncen]

/test pull-br-integration-test

[tiprow]

@YuJuncen: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/test pull-br-integration-test

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.