Variable `isDev` is not used in both tests.
The tests run dev/prod modes based on the different test scenarios.
## Bug
- [x] Integration tests clean up
## Documentation / Examples
- [x] Make sure the linting passes
Follow-up to https://github.com/vercel/next.js/pull/20628 this ensures `isReady` is not initially true when the query isn't present but the page is an automatically statically optimized dynamic route