Vulkan: Enable a bunch of texture related tests Also adds a small bugfix in PixelBuffer::stageSubresourceUpdateFromFramebuffer where we weren't using the right format for the pack pixels params. The format should be unsized so that the fastcopyfunc / colorwritefunc / colorreadfunc are found correctly if needed when packing pixels. Bug: angleproject:2653 Bug: angleproject:2501 Change-Id: Ie4aacc623ddc9583360ab0c99be19d3db2bdbf44 Reviewed-on: https://chromium-review.googlesource.com/1104395 Commit-Queue: Luc Ferron <lucferron@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>