disttask: fix routine leak & refine logs & refactor failpoint

[D3Hunter]

What problem does this PR solve?

Issue Number: ref #49008

Problem Summary:

What changed and how does it work?

• fix routine leak
• refactor failpoints
• refine logs
• random chose nodes for HA cases
• remove duplicate HA cases

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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[D3Hunter]

duplicate with cases in ha_test

[codecov]

Codecov Report

Merging #50912 (5ef463f) into master (134d2bf) will increase coverage by 2.2070%.
Report is 17 commits behind head on master.
The diff coverage is 86.9863%.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #50912        +/-   ##
================================================
+ Coverage   70.5268%   72.7338%   +2.2070%     
================================================
  Files          1467       1467                
  Lines        433920     437015      +3095     
================================================
+ Hits         306030     317858     +11828     
+ Misses       108657      99103      -9554     
- Partials      19233      20054       +821     

Flag	Coverage Δ
integration	48.9166% <68.5714%> (?)
unit	70.2672% <84.9315%> (-0.0714%)	⬇️

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

Components	Coverage Δ
dumpling	54.2940% <ø> (ø)
parser	∅ <ø> (∅)
br	51.1239% <ø> (+5.3864%)	⬆️

[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/disttask/OWNERS [ywqzzy]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-02-04 03:56:52.92407667 +0000 UTC m=+69938.490846545: ☑️ agreed by okJiang.
• 2024-02-04 06:08:20.273334132 +0000 UTC m=+77825.840104006: ☑️ agreed by ywqzzy.