fix: run babel-plugin-jest-hoist as exit visitor

[SimenB]

Summary

Fixes #7633

Test plan

Integration test added

[SimenB]

Hmm, this broke the injected babel helpers 😢

[jeysal]

Whitelisting the helpers would probably suck because it would need frequent updating.
Best I can come up with would be to also do a pass to collect identifiers on enter, and then on exit do a pass, but only throw for identifiers included in the set generated on enter.

[SimenB]

That's a good idea, it should work! Will test tomorrow

[jeysal]

Great, let me know if you encounter any issues with that approach :)

[SimenB]

If you have time now, it'd be awesome if you could test it :)

[jeysal]

Not today I'm afraid, but if you want to focus on other stuff and want me to take over and get this running properly I'd be happy to help. Done quite some stuff with Babel in the past.

[SimenB]

Took a closer look at the logic now, and if you have some understanding of babel plugin, I'd love for you to take over this one! 😀

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