feat(jest-config): merge preset globals with project globals

[jdpearce]

Summary

Resolves #9026

Test plan

Unit test "preset with globals" added to packages/jest-config/src/__tests__/normalize.test.js

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[jdpearce]

I'm afraid I have no idea why test-node-12 is failing. That seems to have no relation to the code that I modified/added. 🤷

[thymikee]

It happens on other builds as well, don't worry about it for now

[SimenB]

project vs global is so confusing 🙁

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