br: fix a PromQL syntax error

[BornChanger]

What problem does this PR solve?

Issue Number: close #60212

Problem Summary:

fix a promql syntax issue in backup&restore panel. As a workaround, please goto tikv panel to check br related metrics.

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.

None

[tiprow]

Hi @BornChanger. Thanks for your PR.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.6645%. Comparing base (634e6ab) to head (c745ce7).
Report is 3 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #60705        +/-   ##
================================================
+ Coverage   73.1298%   74.6645%   +1.5346%     
================================================
  Files          1716       1732        +16     
  Lines        475628     475732       +104     
================================================
+ Hits         347826     355203      +7377     
+ Misses       106416      98450      -7966     
- Partials      21386      22079       +693     

Flag	Coverage Δ
integration	46.0174% <ø> (?)
unit	72.3473% <ø> (ø)

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

Components	Coverage Δ
dumpling	52.6553% <ø> (ø)
parser	∅ <ø> (∅)
br	62.3119% <ø> (+14.8629%)	⬆️

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-04-22 09:58:01.637357514 +0000 UTC m=+349625.449147893: ☑️ agreed by joccau.
• 2025-04-22 10:16:06.425897249 +0000 UTC m=+350710.237687630: ☑️ agreed by 3pointer.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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Needs approval from an approver in each of these files:

• br/OWNERS [3pointer]

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #60712.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.1: #60713.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.1: #60714.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.5: #60715.