Simplify GPUExternalTexture WebCodecsVideoFrame implementation Instead of using separate paths for remote and local textures, we can use SharedVideoFrameReader/Writer for both.
<rdar://problem/110274148>
Pull request: https://github.com/WebKit/WebKit/pull/14687
Committed 268232@main (f9d7fea52f90): <https://commits.webkit.org/268232@main> Reviewed commits have been landed. Closing PR #14687 and removing active labels.