br: fix a PromQL syntax error (#60705)

[ti-chi-bot]

This is an automated cherry-pick of #60705

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
• [X] 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

[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[ti-chi-bot[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.

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1. It must be approved by the approvers firstly.
2. AFTER it has been approved by approvers, please wait for the cherry-pick merging approval from triage owners.

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[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :warning: Please upload report for BASE (release-7.1@7e3ec4e). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-7.1     #60713   +/-   ##
================================================
  Coverage               ?   73.4596%           
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  Files                  ?       1213           
  Lines                  ?     382162           
  Branches               ?          0           
================================================
  Hits                   ?     280735           
  Misses                 ?      83486           
  Partials               ?      17941           

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[lybcodes]

/test pull-e2e-test

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/test pull-e2e-test

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[lybcodes]

/test pull-integration-common-test

[lybcodes]

/test pull-integration-ddl-test

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/test pull-integration-common-test

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/test pull-integration-binlog-test

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/test pull-integration-ddl-test

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[lybcodes]

/test pull-integration-jdbc-test

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/test pull-integration-copr-test

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[lybcodes]

/test pull-integration-mysql-test

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/test pull-integration-copr-test

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[ti-chi-bot[bot]]

@ti-chi-bot: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-e2e-test	356bc8fd666511434b22596a814f4e8d2b8fdf37	link	false	/test pull-e2e-test
pull-integration-common-test	356bc8fd666511434b22596a814f4e8d2b8fdf37	link	false	/test pull-integration-common-test

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