Delete ReactNativeStack 🎉 🎉 🎉 (#10511)

* Removed createReactNativeComponentClassStack and renamed createReactNativeComponentClassFiber => createReactNativeComponentClass

* Removed findNumericNodeHandleStack and renamed findNumericNodeHandleFiber => findNumericNodeHandle

* Renamed ReactNativeFiberEntry => ReactNativeEntry

* Removed all references to ReactNativeFeatureFlags and RN stack

* Removed severl RN modules that are no longer used

* Renamed ReactNativeEntry => ReactNativeFiberEntry for now. We'll probably remove 'fiber' references later

* Update build results json

* Deleted snapshot

* Re-add accidentally deleted test

* Remove now-unnecessary hack in test

* Fix lint

* RN findNodeHandle no longer adds props directly to read-only owner (#10520)

* Added ReactNativeMount-test snapshot for 'renders and reorders children' test