dxf: add keyspace name to global task table

[D3Hunter]

What problem does this PR solve?

Issue Number: ref #61702

Problem Summary:

What changed and how does it work?

as title, and we use keyspace name of current instance as the task keyspace

Check List

Tests

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

bootstrap a new cluster with PR, check table schema correct. also test with a upgrade scenario, all success

• 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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[codecov]

Codecov Report

Attention: Patch coverage is 86.36364% with 3 lines in your changes missing coverage. Please review.

Project coverage is 75.2400%. Comparing base (5343560) to head (162a8db).
Report is 17 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #61755        +/-   ##
================================================
+ Coverage   73.0870%   75.2400%   +2.1530%     
================================================
  Files          1730       1746        +16     
  Lines        481184     485352      +4168     
================================================
+ Hits         351683     365179     +13496     
+ Misses       107956      97977      -9979     
- Partials      21545      22196       +651     

Flag	Coverage Δ
integration	46.6289% <0.0000%> (?)
unit	72.6903% <86.3636%> (+0.3622%)	⬆️

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

Components	Coverage Δ
dumpling	52.7804% <ø> (ø)
parser	∅ <ø> (∅)
br	64.3804% <ø> (+17.4054%)	⬆️

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[Benjamin2037]

LGTM

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-06-18 02:47:49.99369946 +0000 UTC m=+239922.716878439: ☑️ agreed by Benjamin2037.
• 2025-06-18 08:29:08.540802897 +0000 UTC m=+260401.263981945: ☑️ agreed by wjhuang2016.

[3pointer]

tidb_global_task is unrecoverable table.

[yudongusa]

Please also open a document PR

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: 3pointer, Benjamin2037, wjhuang2016, yudongusa

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Details

Needs approval from an approver in each of these files:

• br/OWNERS [3pointer]
• pkg/disttask/OWNERS [Benjamin2037,wjhuang2016]
• pkg/session/OWNERS [yudongusa]

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