bundle-analyzer: exclude traces from output types (#98536)
## Summary
Exclude traced project files from emitted output-type classification in
the bundle analyzer.
Traced TypeScript sources are synthetic provenance entries, but were
classified as assets because their filenames do not use an emitted
JavaScript extension. This could make JavaScript sources appear red in
the treemap even when their emitted chunks are JavaScript.
## Verification
- `pnpm --filter=@next/bundle-analyzer-ui build`
<!-- NEXT_JS_LLM -->
