patch react via recast instead of string replacements (#78916)
In #78838, we've seen that patching react via string replacements is
problematic, because we accidentally replaced a `setTimeout` in a string
literal (emitted into HTML by Fizz). This PR converts most of our react
patching to use `recast` instead. This also lets us be smarter about how
we convert `setTimeout` to `setTimeoutOrImmediate` -- i'm removing the
duration arg, and potentially preserving `setTimeout(fn, 0,
...ARGS_FOR_CALLBACK)`
