test(core): reduce nesting depth of test structures

[kuhe]

Issue

internal P364285277

Description

reduce nesting depth of generated test objects as the high end can in rare cases cause a stack overflow

Testing

ci

Checklist

• If the PR is a feature, add integration tests (*.integ.spec.ts).
• If you wrote E2E tests, are they resilient to concurrent I/O?
• If adding new public functions, did you add the @public tag and enable doc generation on the package?

[github-actions]

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