add support for Explicit Resource Management to mocked functions

[phryneas]

Summary

This implements #14294

Spied-on functions can now be instantiated with using instead of const and they will be restored once the current scope is left.

Test plan

I added a ~~test to jest-mock~~ an integration test.

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[phryneas]

Generally, I don't really know what to make of these node16 failures, so I'd be happy for any feedback. As this feature is not available there, is it sensible to skip the tests there?

[mrazauskas]

As this feature is not available there, is it sensible to skip the tests there?

Yes. Usually tests are skipped, if some feature is not supported. The onNodeVersions() helper is used for that (look around for usage examples): https://github.com/jestjs/jest/blob/8bbe2a34a8a7979d71ece3fadc6006df3e607d9f/packages/test-utils/src/ConditionalTest.ts#L33-L35

It would be good to mention the feature in documentation. That is a good place to clear out the requirements like Node.js or TypeScript versions.

[phryneas]

I've also added some docs. I hope the place works, and if you have any suggestions for better examples, I'm very open to feedback. Good docs examples are not my biggest strength :)

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