efcbb27450 Add Instant Insights pipeline spans (#95961)
## Summary

- Adds a detached `Instant Insights` root span.
- Surfaces `Prepare validation inputs` and `Run validation` as child
phases.
- Covers both the validation worker and Webpack’s in-process path.
- Stores these spans separately from the foreground request.
- Preserves scheduling, cancellation, and concurrent-document behavior.

## Verification

```bash
pnpm build-all
pnpm --filter=next types
pnpm --filter=next build
pnpm test-unit --runTestsByPath packages/next/src/next-devtools/dev-overlay/components/request-insights/trace-viewer.test.ts
pnpm test-dev-turbo test/development/app-dir/request-insights/request-insights.test.ts
pnpm test-dev-webpack test/development/app-dir/request-insights/request-insights.test.ts
pnpm test-dev-turbo test/development/app-dir/instant-validation-scheduling/instant-validation-scheduling.test.ts
```

<!-- NEXT_JS_LLM -->

---------

Co-authored-by: David Ilie <[email protected]>
2026-07-28 14:15:21 -04:00
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2026-07-14 08:03:43 +02:00
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