ddl: fix context usage and wait adjust worker count routine exit before return

[D3Hunter]

What problem does this PR solve?

Issue Number: close #59016, ref #57229

Problem Summary:

What changed and how does it work?

Check List

Tests

• Unit test, existing cases from ddl: dynamically adjusting the concurrency and batch size of reorganization job #57468 should covered it
• 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]

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: fzzf678, tangenta

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-01-17 09:13:45.410589594 +0000 UTC m=+282696.865635740: ☑️ agreed by tangenta.
• 2025-01-17 09:14:19.883326747 +0000 UTC m=+282731.338372893: ☑️ agreed by fzzf678.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.8630%. Comparing base (f7c94c8) to head (b7e9cdc).
Report is 2 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #59020        +/-   ##
================================================
+ Coverage   73.0164%   74.8630%   +1.8465%     
================================================
  Files          1685       1731        +46     
  Lines        465917     474142      +8225     
================================================
+ Hits         340196     354957     +14761     
+ Misses       104790      96747      -8043     
- Partials      20931      22438      +1507     

Flag	Coverage Δ
integration	48.7069% <63.6363%> (?)
unit	72.2601% <100.0000%> (+0.0324%)	⬆️

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

Components	Coverage Δ
dumpling	52.6910% <ø> (ø)
parser	∅ <ø> (∅)
br	61.0077% <ø> (+15.7383%)	⬆️

[D3Hunter]

/retest

[tiprow]

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/retest

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