In a recent update we make Flight start working immediately rather than waitin for a new task. This commit updates fizz to have similar mechanics. We start the render in the currently running task but we do so in a microtask to avoid reentrancy. This aligns Fizz with Flight. ref: https://github.com/facebook/react/pull/30961 DiffTrain build for [67fee58b1f](https://github.com/facebook/react/commit/67fee58b1f72754cc77488c40c44e786572ef954)
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