chore(ci): Move `@turbo/repository` tests into main test workflow (#11396)
## Summary
- Consolidate `@turbo/repository` native library tests from a separate
workflow into `turborepo-test.yml`
- Tests now use the existing "Test Summary" required check instead of a
separate required check
- Fixes the issue where native lib tests blocked PRs when they didn't
run due to path filtering
## Changes
- Add `native-lib` path detection in `find-changes` job (detects changes
in `packages/turbo-repository/` and `crates/`)
- Add `js_native_packages` job conditional on `native-lib` changes
- Include `js_native_packages` in Test Summary aggregation
- Delete the now-redundant `turborepo-native-lib-test.yml`
## Note
After merging, you can remove the "Native Library Tests" required check
from GitHub branch protection settings since it's now covered by "Test
Summary".