ddl: enlarge general ddl worker pool

[D3Hunter]

What problem does this PR solve?

Issue Number: ref #53246

Problem Summary:

What changed and how does it work?

• enlarge general ddl worker pool to 10 which is the same as reorg worker pool size

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)

using create table/db as a general ddl example, and use infoschema v1:

• on 8.1: create 100K tables(under same database)/databases on owner on 1pd/3tidb/3tikv using 10 threads takes 3h49m/8h27m

• after this pr(there're other pr that contribute to the speedup, see linked pr in the issue): same config, takes 50m/2h42m

• 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

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.9129%. Comparing base (26d1096) to head (a57b9a4).
Report is 2 commits behind head on master.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #54041         +/-   ##
=================================================
- Coverage   74.5821%   55.9129%   -18.6692%     
=================================================
  Files          1516       1636        +120     
  Lines        360770     605266     +244496     
=================================================
+ Hits         269070     338422      +69352     
- Misses        72225     243624     +171399     
- Partials      19475      23220       +3745     

Flag	Coverage Δ
integration	37.1652% <90.0000%> (?)
unit	71.5331% <100.0000%> (-1.9444%)	⬇️

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

Components	Coverage Δ
dumpling	52.9656% <ø> (-2.2339%)	⬇️
parser	∅ <ø> (∅)
br	50.6594% <ø> (+6.6582%)	⬆️

[D3Hunter]

/hold

some test depends on 1 worker, need fix them

[Benjamin2037]

LGTM

code changed

[D3Hunter]

/unhold

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-06-17 12:07:20.738655519 +0000 UTC m=+30167.224144343: ☑️ agreed by Benjamin2037.
• 2024-06-18 02:17:22.994951209 +0000 UTC m=+81169.480440041: ☑️ agreed by lance6716.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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