br: fix checkpoint path

[Leavrth]

What problem does this PR solve?

Issue Number: close #55265

Problem Summary:
WalkDir the path {bucket}/{prefix}//{sub-dir} get the object {bucket}/{prefix}//{sub-dir}/object, but ReadFile the object {bucket}/{prefix}//{sub-dir}/object cannot find it.

What changed and how does it work?

/checkpoints -> checkpoints

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 @Leavrth. Thanks for your PR.

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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Needs approval from an approver in each of these files:

• br/OWNERS [3pointer,YuJuncen]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-08-07 09:12:07.807151915 +0000 UTC m=+429657.674251003: ☑️ agreed by YuJuncen.
• 2024-08-07 09:20:00.048907733 +0000 UTC m=+430129.916006820: ☑️ agreed by 3pointer.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.2474%. Comparing base (3117d3f) to head (d3b997d).
Report is 7 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #55266        +/-   ##
================================================
+ Coverage   74.7769%   75.2474%   +0.4705%     
================================================
  Files          1572       1572                
  Lines        364757     441413     +76656     
================================================
+ Hits         272754     332152     +59398     
- Misses        72233      88564     +16331     
- Partials      19770      20697       +927     

Flag	Coverage Δ
integration	49.6211% <ø> (?)
unit	71.8302% <ø> (-1.8751%)	⬇️

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

Components	Coverage Δ
dumpling	52.9567% <ø> (-2.2327%)	⬇️
parser	∅ <ø> (∅)
br	62.3001% <ø> (+14.6296%)	⬆️

[Leavrth]

/ok-to-test

[Leavrth]

/retest

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.1: #55295.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #55296.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.1: #55297.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #55298.