Remove all usage of jest-file-exists.

[wtgtybhertgeghgtwtg]

Summary
Removes all usage of the jest-file-exist package. With one exception, it was just a wrapper around fs.existsSync.

Test plan
Nothing should change.

[cpojer]

Oh yeah, this is interesting. I think jest-file-exists made more sense when fs.existsSync was deprecated and we were meant to use fs.accessSync instead. I also hoped to optimize the best-case-runtime of this with hasteFS.exists in more places but seems like that wasn't the case :)

Would you mind sending a follow-up PR that actually removes jest-file-exists from the Jest repo? It seems like it is past its lifetime :)

[wtgtybhertgeghgtwtg]

I'd be happy to, but isn't that a breaking change?

[cpojer]

No, it's fine. If we are not using it within Jest and will never update it ever again, we can simply drop it.

[github-actions]

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