br: fix Log Backup unexpected paused when adding a already long-running task

[RidRisR]

What problem does this PR solve?

Issue Number: close #53561

Problem Summary:

What changed and how does it work?

Now, advancer will sync checkpoint with pd when adding a new task

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 Log Backup unexpected paused when adding a long-run task

[tiprow]

Hi @RidRisR. Thanks for your PR.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.3560%. Comparing base (df64c34) to head (ade28a2).
Report is 92 commits behind head on master.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #53695         +/-   ##
=================================================
- Coverage   72.4222%   56.3560%   -16.0662%     
=================================================
  Files          1505       1630        +125     
  Lines        430553     616844     +186291     
=================================================
+ Hits         311816     347629      +35813     
- Misses        99427     245109     +145682     
- Partials      19310      24106       +4796     

Flag	Coverage Δ
integration	24.1904% <63.6363%> (?)
unit	71.4456% <100.0000%> (+0.0441%)	⬆️

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Components	Coverage Δ
dumpling	52.9656% <ø> (-1.0302%)	⬇️
parser	∅ <ø> (∅)
br	60.7011% <100.0000%> (+19.3140%)	⬆️

[RidRisR]

/test check-dev2

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[RidRisR]

/test pull-br-integration-test

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[YuJuncen]

rest lgtm

[YuJuncen]

Could you add some comments about how these tree OnTicks verify the task wasn't paused?

[RidRisR]

The first time is to check there is no error before update global checkpoint
The second time is to check there is no error after update global checkpoint
The third time is redundant to check if there is any other potential problems

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[BornChanger]

/retest

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[RidRisR]

/test mysql-test

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/test pull-br-integration-test

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[BornChanger]

/retest

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[RidRisR]

/test pull-br-integration-test

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #53945.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.1: #53946.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #53947.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.1: #53948.