Fix: Release skia resources when RenderNode layer is configured

-Updated StretchEffect to null out the child texture
of the SkRuntimeEffectBuilder after the shader is created
-Release optional mask surface used for
stretching the hole punch
-Release SkRuntimeEffectBuilder instance on RenderNode's
StretchEffect

Fixes: 183592264
Test: manual + re-ran cts tests
Change-Id: I90952666d7489985de9ce798ab792cf3fd7f6087