dillon1000/react

[sprout] Enable sprout on all new fixtures

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Rename `SproutOnlyFilterTodoRemove.ts` to `SproutTodoFilter.ts`. I've tried to 
group the skipped fixtures by difficulty and add comments about what need to be 
done, also happy to change the structure of this. 

From this point, sprout will run on all new fixtures by default. If the fixture 
forgets to export a `FIXTURE_ENTRYPOINT`, sprout will fail with this error. 

<img width="853" alt="Screenshot 2023-08-15 at 5 59 32 PM" 
src="https://github.com/facebook/react-forget/assets/34200447/0f80d650-1dc1-4df4-9710-e49acbb424b0"> 

See #1961 for an example of how to annotate existing skipped fixtures or new 
ones. The `README.md` is also updated with a guide.