tests: Make FrameSinkVideoCapturer supports RGBA with NativeTexture Part 2

Add test to `mojom::BufferFormatPreference::kPreferGpuMemoryBuffer + media::PIXEL_FORMAT_NV12`

Change-Id: I2622ad6582b460831547ca568b5d174ec31f8557
Bug: 324934085
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5311841


Reviewed-by: Kyle Charbonneau <kylechar@chromium.org>
Commit-Queue: Kyle Charbonneau <kylechar@chromium.org>
Reviewed-by: Mark Foltz <mfoltz@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1267465}