Upgrade to jest 27 (#7699)
* use jest@27.4.0, replace jest-environment-jsdom-sixteen with jest-environment-jsdom
Signed-off-by: Kerry Archibald <kerrya@element.io>
* polyfill setImmediate
Signed-off-by: Kerry Archibald <kerrya@element.io>
* remove done from async test cases
* useRealTimers in test relying on promise flushing
Signed-off-by: Kerry Archibald <kerrya@element.io>
* remove jest environment file
Signed-off-by: Kerry Archibald <kerrya@element.io>
* replace ts-jest mocked with jest utils mocked
Signed-off-by: Kerry Archibald <kerrya@element.io>
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