This reverts commit 375453a.

This reverts #9673 and
#9711.

With v6 of `@testing-library/jest-dom`, `yarn rw type-check` fails in
Redwood projects because it can't locate the types for
`@testing-libary/jest-dom`. They absorbed the definitely types package
(`@types/testing-library__jest-dom`) in this PR:
testing-library/jest-dom#511. Here's an example
of a failing run:
https://github.com/redwoodjs/redwood/actions/runs/7213177056/job/19668365614?pr=9708.

The logical thing to do is remove `@testing-libary/jest-dom` from the
`types` array in `web/tsconfig.json`, but when we do that we get a
different failure from TS saying that it doesn't understand the extended
matchers provided by `testing-library/jest-dom` like
`toBeInTheDocument`.

@Tobbe filed an issue in their repo here
testing-library/jest-dom#559.

In the PR I linked to, the maintainer notes that...

> But in my local testing with the changes in this PR, following the
Readme was sufficient to get full auto-complete support even for JS-only
users. As long as they have a jest-setup file that imports the bare
export and add a dependency on @types/jest, recent versions of VS Code
will figure it out.

Users don't have jest setup files in their project (we just point to a
jest preset) or `@types/jest` as an explicit dev dependency.

I took a look at it but couldn't crack it today. Instead of holding up
other PRs in CI, better to revert it for now and come back to later when
we have more leads.