Make all tests pass on Windows

[thymikee]

Do you want to request a feature or report a bug?
enhancement!

What is the current behavior?
We skip a lot of tests on Windows.

What is the expected behavior?
To fully (or as much as possible) support Jest on Windows.

@wtgtybhertgeghgtwtg is already making some awesome work to make that happen.
This issue is created to have a track on what's left to fix.

[wtgtybhertgeghgtwtg]

A majority of the tests that are not run on Windows are that way because of the way node handles path separators on Windows (\\ instead of /). For the most part, this can be mitigated using slash, but there are some caveats.
The main thing holding this up is that the tight coupling between jest-cli, jest-config, and jest-haste-map prevents the underlying issues from being handled one at a time.

[PeteDuncanson]

How to know which ones need "slashing up" and which ones are deeper issues? Is it just a case of diving in or are there some pointers for what to look for?

[wtgtybhertgeghgtwtg]

Pretty much. Most of the remaining ones are deeply connected, though, so fixing one probably necessitates fixing a bunch of other ones.

[rickhanlonii]

Any more progress we can make here?

[github-actions]

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