tests: add create index realtikv test for next_gen

[tangenta]

What problem does this PR solve?

Issue Number: ref #61702

Problem Summary:

What changed and how does it work?

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 @tangenta. Thanks for your PR.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.0458%. Comparing base (5ec4f36) to head (89364eb).
Report is 54 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #62326        +/-   ##
================================================
+ Coverage   72.8857%   74.0458%   +1.1600%     
================================================
  Files          1751       1790        +39     
  Lines        484653     507071     +22418     
================================================
+ Hits         353243     375465     +22222     
+ Misses       109782     108927       -855     
- Partials      21628      22679      +1051     

Flag	Coverage Δ
integration	45.3532% <0.0000%> (?)
unit	72.2637% <100.0000%> (+0.1235%)	⬆️

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Components	Coverage Δ
dumpling	52.7804% <ø> (ø)
parser	∅ <ø> (∅)
br	46.3513% <ø> (+0.0318%)	⬆️

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[tangenta]

/retest

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[D3Hunter]

rest lgtm

[D3Hunter]

why run those cleanup here?

[tangenta]

So we can make sure there is no partial DDL/DXF state from the previous real tikv tests.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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Needs approval from an approver in each of these files:

• OWNERS [D3Hunter,hawkingrei]
• pkg/disttask/OWNERS [D3Hunter]
• pkg/planner/OWNERS [hawkingrei]
• pkg/statistics/OWNERS [hawkingrei]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-07-18 04:43:06.441246065 +0000 UTC m=+2838839.164425051: ☑️ agreed by D3Hunter.
• 2025-07-18 06:12:48.76623173 +0000 UTC m=+2844221.489410713: ☑️ agreed by hawkingrei.