br: fix checkpoint cannot advance after pause->stop->start (#53091)

[ti-chi-bot]

This is an automated cherry-pick of #53091

What problem does this PR solve?

Issue Number: close #53047
Problem Summary:

What changed and how does it work?

When advancer stop a task, the isPaused would be marked as false

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.

fix when checkpoint cannot advance after pause->stop->start

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (release-7.1@d1e3dee). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-7.1     #53166   +/-   ##
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  Coverage               ?   73.9683%           
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  Files                  ?       1211           
  Lines                  ?     384121           
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  Hits                   ?     284128           
  Misses                 ?      82219           
  Partials               ?      17774           

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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• OWNERS [Leavrth,YuJuncen]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-07-01 02:46:24.157187501 +0000 UTC m=+1206110.642676329: ☑️ agreed by YuJuncen.
• 2024-07-05 09:51:33.297843524 +0000 UTC m=+5590.533077634: ☑️ agreed by Leavrth.

[RidRisR]

/retest