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Upgrade to Jest 26

Merged Administrator requested to merge github/fork/ianschmitz/jest-26 into master

Created by: ianschmitz

Closes #8954 (closed).

We can ship the TypeScript template referencing @types/jest@25 until the 26 version drops. There should only be minor differences that we can call out in our release notes. From Simen:

main changes from 25 to 26 would be removal of require.requireActual, adding jest.useFakeTimers('modern') and adding jest.createMockFromModule()

Still todo:

  • Figure out types migration path - we include @types/jest in the TypeScript template. We may require TypeScript 3.8: https://github.com/facebook/jest/pull/9823. Need to sync with Simen to figure out the details

cc @SimenB.