Vulkan: Require sampling support for attachments. Since Framebuffer attachments can be copied from with CopyTexImage, we must require transfer support. This will affect the amount of formats we can expose correctly for different uses. Bug: angleproject:3876 Change-Id: I0343da94b5f8e05dca946e7029ffb8fdf155bb41 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1803756 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org>