We've removed the in-shader mask implementations of the blur styles (https://github.com/flutter/flutter/issues/122658). After https://github.com/flutter/flutter/issues/122657 is done, we can re-implement BlurStyle.[inner/outer] using the stencil (possibly will need a mask compositing fallback).
