ddl: fix reorg handle not resumed after changing DDL owner (#56507)

[ti-chi-bot]

This is an automated cherry-pick of #56507

What problem does this PR solve?

Issue Number: close #56506

Problem Summary:

1. doneTaskKeeper starts from 0, but taskIDAllocator starts from 1.
2. "not owner" error is eaten by context.Canceled.

What changed and how does it work?

Allocate task ID from 0.

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

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: D3Hunter, tangenta

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [D3Hunter,tangenta]
• pkg/ddl/OWNERS [tangenta]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-12-12 06:14:43.288532227 +0000 UTC m=+505473.377334766: ☑️ agreed by tangenta.
• 2024-12-12 06:19:54.255278439 +0000 UTC m=+505784.344080977: ☑️ agreed by D3Hunter.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (release-7.5@4df9aa8). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-7.5     #57926   +/-   ##
================================================
  Coverage               ?   72.1459%           
================================================
  Files                  ?       1416           
  Lines                  ?     413250           
  Branches               ?          0           
================================================
  Hits                   ?     298143           
  Misses                 ?      95106           
  Partials               ?      20001           

Flag	Coverage Δ
unit	72.1459% <100.0000%> (?)

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

Components	Coverage Δ
dumpling	52.9400% <0.0000%> (?)
parser	∅ <0.0000%> (?)
br	53.5556% <0.0000%> (?)