Summary:
This is the next step in moving RN towards standard path-based requires. All the requires in `Libraries/vendor` have been rewritten to use relative requires. Talking to cpojer, the vendored code in RN can be modified directly.
This commit uses relative requires instead of `react-native/...` so that if Facebook were to stop syncing out certain folders and therefore remove code from the react-native package, internal code at Facebook would not need to change.
Closes#24769.
[General] [Changed] - Migrate vendored code from Haste to path-based imports
Pull Request resolved: https://github.com/facebook/react-native/pull/24807
Differential Revision: D15316831
Pulled By: cpojer
fbshipit-source-id: 19475823ce9f506600bd09b001156e306bff4db8