Vulkan: Re-enable multisample framebuffer fetch Bug: angleproject:7351 Bug: angleproject:3586 Bug: angleproject:6195 Bug: angleproject:7512 Bug: b/234173199 Change-Id: Ib70732f8c075de777e534f950a7e421e75969f59 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3781613 Reviewed-by: Charlie Lao <cclao@google.com> Commit-Queue: Yuxin Hu <yuxinhu@google.com>