Dependencies: Jest 27 (#42681)

* Update jest monorepo

* Update version of marked so it doesn't throw an error, set testEnvironment

* Fix some unit tests

* Remove all these tests that aren't actually working...

* use spyOn instead of mocking the whole module

* Fix linting

Co-authored-by: Renovate Bot <bot@renovateapp.com>

jest.config.js

@@ -5,6 +5,7 @@ process.env.TZ = 'Pacific/Easter';
 
 module.exports = {
   verbose: false,
+  testEnvironment: 'jsdom',
   transform: {
     '^.+\\.(ts|tsx|js|jsx)$': require.resolve('ts-jest'),
   },