This fixes two issues:
- Sudden worker process exit is properly accounted for.
- We can stop() workers willy-nilly, e.g. after reaching maxFailures.
Details:
- DonePayload does not send `reamining` anymore, and worker does not track it.
- Instead, `Dispatcher._runJob` track remaining tests and acts accordingly.
- Upon worker exit, we emulate a fatal error for all remaining tests.
Drive-by:
- Do not report onTestBegin after reaching maxFailures to avoid confusion.
Before, we did report onTestBegin, but not onTestEnd.
- List reporter aligned between "running" and "finished" state - it was
one character misplaced.
- Added a SIGINT test.
- Source now lives at `src/test`.
- Former folio tests live at `tests/playwright-test`.
- We use `src/test/internal.ts` that exposes base test without
Playwright fixtures for most tests (to avoid modifications for now).
- Test types live in `types/testFoo.d.ts`.
- Stable test runner is installed to `tests/config/test-runner` during `npm install`.
- All deps including test-only are now listed in `package.json`.
Non-test deps must also be listed in `build_package.js` to get included.
