* Move unit tests to one folder
* Migrate unit tests to TypeScript
* add test types to lint
* Ensure ts(x) tests are run with util
* Add tsx extension to jest config
* bump
## Feature
- [x] Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR. [Feature Request](https://github.com/vercel/next.js/discussions/26365)
- [x] Eslint unit ests added
- [x] Errors have helpful link attached, see `contributing.md`
Let me know if this looks good or something needs to be changed. I still need to add the error links and improve the eslint error messages.
I don't know if the CI runs the ESLint tests, but current all pass locally
