[WIP]ddl: let tidb_ddl_reorg_worker_cnt controls fast DDL concurrency

[lance6716]

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What problem does this PR solve?

Issue Number: ref #51272

Problem Summary:

What changed and how does it work?

Check List

Tests

• [ ] Unit test
• [ ] Integration test
• [x] 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[bot]]

Hi @lance6716. Thanks for your PR.

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[codecov[bot]]

Codecov Report

Merging #51261 (204a211) into master (5b187e5) will decrease coverage by 14.9375%. Report is 32 commits behind head on master. The diff coverage is 66.6666%.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #51261         +/-   ##
=================================================
- Coverage   70.7007%   55.7633%   -14.9375%     
=================================================
  Files          1457       1571        +114     
  Lines        433745     611409     +177664     
=================================================
+ Hits         306661     340942      +34281     
- Misses       107895     247586     +139691     
- Partials      19189      22881       +3692     

Flag	Coverage Δ
integration	37.9381% <66.6666%> (?)
unit	71.3317% <0.0000%> (+0.8359%)	:arrow_up:

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

Components	Coverage Δ
dumpling	53.9957% <ø> (ø)
parser	∅ <ø> (∅)
br	51.5811% <ø> (+5.7045%)	:arrow_up:

[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

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

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• ~~pkg/ddl/OWNERS~~ [tangenta,ywqzzy]

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[ti-chi-bot[bot]]

[LGTM Timeline notifier]

Timeline:

• 2024-02-27 07:55:20.879212176 +0000 UTC m=+948609.626835271: :ballot_box_with_check: agreed by tangenta.
• 2024-02-27 07:56:55.056613288 +0000 UTC m=+948703.804236384: :ballot_box_with_check: agreed by ywqzzy.

[lance6716]

/retest

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@lance6716: 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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