testkit: make ut works in nextgen after introduce SYSTEM ks

[D3Hunter]

What problem does this PR solve?

Issue Number: ref #61702

Problem Summary:

What changed and how does it work?

	// in nextgen, SYSTEM ks must be bootstrapped first, to make UT easier, we
	// always run them inside SYSTEM keyspace, if your test requires bootstrapping
	// multiple keyspace, you should use CreateMockStoreAndDomainForKS instead.

Check List

Tests

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

choose random test that uses CreateMockStoreAndDomain and CreateMockStoreWithSchemaLease, and run with nextgen tags, 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

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.8752%. Comparing base (94bfb3d) to head (9af3f22).
Report is 5 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #62113        +/-   ##
================================================
+ Coverage   72.9233%   74.8752%   +1.9519%     
================================================
  Files          1739       1785        +46     
  Lines        482858     490997      +8139     
================================================
+ Hits         352116     367635     +15519     
+ Misses       109170     100289      -8881     
- Partials      21572      23073      +1501     

Flag	Coverage Δ
integration	48.8066% <ø> (?)
unit	72.1693% <ø> (-0.0095%)	⬇️

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Components	Coverage Δ
dumpling	52.7804% <ø> (ø)
parser	∅ <ø> (∅)
br	63.0038% <ø> (+16.6730%)	⬆️

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-07-01 07:05:47.381101238 +0000 UTC m=+1378600.104280220: ☑️ agreed by hawkingrei.
• 2025-07-01 07:19:01.937657827 +0000 UTC m=+1379394.660836809: ☑️ agreed by lance6716.

[D3Hunter]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: D3Hunter, hawkingrei, lance6716, tiancaiamao

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Details

Needs approval from an approver in each of these files:

• OWNERS [D3Hunter,hawkingrei,lance6716,tiancaiamao]
• pkg/disttask/OWNERS [D3Hunter]
• pkg/domain/OWNERS [D3Hunter]

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