Summary:
This PR fixes two issues with `display: contents` implementation:
1. When a node with `display: contents` set is a leaf, it won't be cloned after the initial tree is built. The added test case covers this scenario.
2. It was possible for the subtree of `display: contents` nodes not to be cloned during layout. I don't have a minimal reproduction for this one, unfortunately. It was discovered in the Expensify app: https://github.com/Expensify/App/issues/65268, along with a consistent reproduction. In that specific case, it seems to be heavily tied to `react-native-onyx`, which is a state management library.
Changelog: [GENERAL][FIXED] - Fixed nodes with `display: contents` set being cloned with the wrong owner
Reviewed By: adityasharat
Differential Revision: D78084270
Pulled By: j-piasecki
