Per-file @jest/globals

[joshkel]

Summary

This fixes #15772 by giving each import of @jest/globals its own synthetic module.

My assumption is that making extra @jest/globals objects won't be a problem because @jest/globals will not have many imports from a single test suite and that Jest objects are relatively cheap to construct. If either of these assumptions is wrong, let me know.

If this approach seems reasonable, I can see about adding test coverage.

Test plan

I tested against https://github.com/joshkel/jest-globals-bug and confirmed that the bug went away.

Fixes #15772

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commit: 78a86c6

[cpojer]

Yup, this makes sense.

Could you send a separate PR with a test?