disttask: change extra running subtasks to pending

[D3Hunter]

What problem does this PR solve?

Issue Number: ref #49008

Problem Summary:

What changed and how does it work?

• change extra running subtasks to pending, so they could be balanced to other node
• fix bug that startCancelCheck queries all subtasks, but we only schedule subtasks of current step during balance.

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

Merging #50266 (4aaf243) into master (1c4b27c) will decrease coverage by 14.3165%.
The diff coverage is 91.9191%.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #50266         +/-   ##
=================================================
- Coverage   70.0102%   55.6937%   -14.3165%     
=================================================
  Files          1444       1550        +106     
  Lines        419954     582591     +162637     
=================================================
+ Hits         294011     324467      +30456     
- Misses       105629     235407     +129778     
- Partials      20314      22717       +2403     

Flag	Coverage Δ
integration	36.4092% <49.4382%> (?)
unit	69.9895% <92.7835%> (-0.0208%)	⬇️

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

Components	Coverage Δ
dumpling	54.0269% <ø> (ø)
parser	∅ <ø> (∅)
br	55.2282% <ø> (+5.5515%)	⬆️

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: okJiang, ywqzzy

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Needs approval from an approver in each of these files:

• OWNERS [okJiang,ywqzzy]
• pkg/ddl/OWNERS [ywqzzy]
• pkg/disttask/OWNERS [ywqzzy]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-01-11 03:41:14.969982587 +0000 UTC m=+501064.554236493: ☑️ agreed by okJiang.
• 2024-01-12 02:53:03.925285661 +0000 UTC m=+584573.509539356: ☑️ agreed by ywqzzy.

[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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