Add negation pattern support to `--debug-build-paths` (#88654)
Patterns prefixed with `!` now exclude matching files from the `next build --debug-build-paths` option.
Using only negation patterns will build everything except the excluded paths.
Examples:
- `--debug-build-paths 'app/**,!app/[lang]/**'` - build all app routes except `[lang]`
- `--debug-build-paths '!app/admin/**'` - build everything except admin routes
