[lazerg]

Summary:

The reactnative prefab in react-android ships the headers for view, image, root, text and textinput, but not scrollview, even though libreactnative.so already contains rrc_scrollview. So a library building against the AAR can link ScrollView's shadow node and state but can't include ScrollViewComponentDescriptor.h or ScrollViewShadowNode.h. This adds rrc_scrollview and its platform/android folder to preparePrefab, the same way rrc_textinput is exported.

Fixes #59929

Changelog:

[ANDROID] [FIXED] - Expose rrc_scrollview headers via prefab

Test Plan:

I don't have Java or the Android SDK on this machine, so I couldn't run preparePrefab itself. Instead I took the prefab includes from the 0.89.0-rc.1 react-android AAR (plus the jsi and fbjni prefabs), copied the scrollview headers in with the same layout these two Pairs produce, and ran clang++ -fsyntax-only on a file that includes ScrollViewComponentDescriptor.h and returns concreteComponentDescriptorProvider<ScrollViewComponentDescriptor>(). With the stock AAR it fails with 'react/renderer/components/scrollview/ScrollViewComponentDescriptor.h' file not found; with the scrollview headers added it compiles.