ttl: fix the issue that TTL job may hang some time when shrink the delete worker count (#55572)

[ti-chi-bot]

This is an automated cherry-pick of #55572

What problem does this PR solve?

Issue Number: close #55561

What changed and how does it work?

• fix some missed count for ErrorRows
• if a scan task is finished, it will wait for all rows to be processed. If it is not finished in a certain time, the task will go one to mark itself as finished.

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

[codecov]

Codecov Report

Attention: Patch coverage is 95.38462% with 3 lines in your changes missing coverage. Please review.

Please upload report for BASE (release-8.1@a7df4f9). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-8.1     #55614   +/-   ##
================================================
  Coverage               ?   71.1781%           
================================================
  Files                  ?       1466           
  Lines                  ?     422939           
  Branches               ?          0           
================================================
  Hits                   ?     301040           
  Misses                 ?     101400           
  Partials               ?      20499           

Flag	Coverage Δ
unit	71.1781% <95.3846%> (?)

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

Components	Coverage Δ
dumpling	52.9656% <0.0000%> (?)
parser	∅ <0.0000%> (?)
br	41.3149% <0.0000%> (?)

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lcwangchao, YangKeao

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-08-23 08:09:25.134999312 +0000 UTC m=+512160.269449434: ☑️ agreed by lcwangchao.
• 2024-08-23 08:25:10.625456622 +0000 UTC m=+513105.759906743: ☑️ agreed by YangKeao.