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Implement support for nested calls to `act`

When calls to act are nested, effects and component updates are only
flushed when the outer `act` call returns, as per [1] and [2].

This is convenient for creating helper functions which may invoke `act`
themselves.

[1] https://github.com/facebook/react/pull/15682
[2] https://github.com/facebook/react/issues/15472

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