Summary:
This adds a unit test to Yoga, which emulates the model of "persistent Yoga nodes" and cloning used by React Fabric, including the private (but relied on) Yoga APIs.
It models the over-invalidation exposed in D75287261, which reproduces (due to Yoga incorrectly measuring flex-basis under fit-content, and that constraint changing when sibling changes) but this test for now sets a definite height on A, to show that we only clone what is neccesary, when measure constraints do not have to change.
Having a minimal version of Fabric's model in Yoga unit tests should make some of these interesting interactions a bit easier to debug.
Changelog: [Internal]
Reviewed By: javache
Differential Revision: D75572762
