Prevents watchers from being awake by created folders

[arcanis]

Summary

Jest Haste Map has an issue that cause it to crash when a folder named [something].js is created. The only check it does it by extension, which isn't good enough (running yarn add md5.js would cause a crash, for example).

Test plan

Not sure how to test folder creation with the Jest Haste Map test infra?

[mattphillips]

Hey @arcanis I think we could add an e2e test for this similar to these tests by creating a directory with name.js/ instead of a file.

Also it looks like you will need to update the haste map unit tests that mock out fs.stats see here to include the isDirectory function

[SimenB]

(also missing a changelog in addition to the test :D)

[arcanis]

Added a test, fixed the linting, updated the changelog 🙂

[github-actions]

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