Add test coverage of YUV format sampling as RGB or directly as YUV and
rendering as YUV using layout(yuv).

Initializing YUV AHardwareBuffers requires Android API 29 so ANGLE must
be compiled with:
android32_ndk_api_level = 29
android64_ndk_api_level = 29

The following tests can still run with Android API 26 because they don't
need to initialize the buffer:
ImageTestES3.ClearYUVAHB
ImageTestES3.YUVValidation

Bug: angleproject:4852
Bug: b/172649538
Change-Id: I4fe9afb2a68fb827dc5a5732b213b5eb60d585ac
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2517562
Commit-Queue: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>