realtikvtest: make import-into/add-index tests works on nextgen

[D3Hunter]

What problem does this PR solve?

Issue Number: ref #61702

Problem Summary:

What changed and how does it work?

		// in nextgen kernel, SYSTEM keyspace must be bootstrapped first, if we
		// don't specify a keyspace which normally is not specified, we use SYSTEM
		// keyspace as default to make sure test cases can run correctly.

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

[tiprow]

Hi @D3Hunter. Thanks for your PR.

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 73.3028%. Comparing base (94bfb3d) to head (d74358d).
Report is 12 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #62112        +/-   ##
================================================
+ Coverage   72.9233%   73.3028%   +0.3795%     
================================================
  Files          1739       1740         +1     
  Lines        482858     484284      +1426     
================================================
+ Hits         352116     354994      +2878     
+ Misses       109170     107691      -1479     
- Partials      21572      21599        +27     

Flag	Coverage Δ
integration	42.4029% <0.0000%> (?)
unit	72.1659% <0.0000%> (-0.0129%)	⬇️

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Components	Coverage Δ
dumpling	52.7804% <ø> (ø)
parser	∅ <ø> (∅)
br	46.3281% <ø> (-0.0026%)	⬇️

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[D3Hunter]

/retest

[tiprow]

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/retest

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[lance6716]

seems NextGen (G is capitalized)

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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Needs approval from an approver in each of these files:

• OWNERS [GMHDBJD,lance6716]
• pkg/disttask/OWNERS [GMHDBJD]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-07-01 07:20:17.058185029 +0000 UTC m=+1379469.781364006: ☑️ agreed by lance6716.
• 2025-07-01 10:25:17.462799202 +0000 UTC m=+1390570.185978178: ☑️ agreed by GMHDBJD.

[hawkingrei]

/retest