Add sparkle noise type in the TurbulenceNoiseShader.

- Pulled out the color turbulence & sparkle as functions.
- Removed background color uniform and combined with in_src, which does
  the same thing.
- Added screen color that is used for the new shader type.
- Updated the tests with the animator rule.
- Marked Flag as NA since this specific change is not guarded with the
  refactor flag.

Bug: 282007590
Test: LoadingEffectTest
Test: TurbulenceNoiseShaderTest
Test: UMO, Wallpaper picker, and AI wallpaper. Ensure they look the
same.
Flag: NA

Change-Id: I98156cb3b4473479a0e132cd09b6cff20c28d502