dxf: refactor failpoints in scheduler

[D3Hunter]

What problem does this PR solve?

Issue Number: ref #57497

Problem Summary:

What changed and how does it work?

• use failpoint.InjectCall to reduce code pollution
• abstract a getTaskClone method

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 @D3Hunter. Thanks for your PR.

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[codecov]

Codecov Report

Attention: Patch coverage is 96.42857% with 1 line in your changes missing coverage. Please review.

Project coverage is 73.4438%. Comparing base (d8c9190) to head (8690fea).
Report is 10 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #57566        +/-   ##
================================================
+ Coverage   72.8374%   73.4438%   +0.6064%     
================================================
  Files          1676       1676                
  Lines        463557     467078      +3521     
================================================
+ Hits         337643     343040      +5397     
+ Misses       105100     103202      -1898     
- Partials      20814      20836        +22     

Flag	Coverage Δ
integration	43.4339% <7.1428%> (?)
unit	72.2277% <96.4285%> (-0.0008%)	⬇️

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

Components	Coverage Δ
dumpling	52.7673% <ø> (+0.1129%)	⬆️
parser	∅ <ø> (∅)
br	45.4058% <ø> (+0.0491%)	⬆️

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lance6716, wjhuang2016

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Needs approval from an approver in each of these files:

• OWNERS [lance6716,wjhuang2016]
• pkg/disttask/OWNERS [lance6716,wjhuang2016]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-11-21 02:20:13.993752564 +0000 UTC m=+84601.613407080: ☑️ agreed by lance6716.
• 2024-11-21 02:59:25.048429979 +0000 UTC m=+86952.668084495: ☑️ agreed by wjhuang2016.

[D3Hunter]

/retest

[tiprow]

@D3Hunter: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/retest

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