Unskip passing tests The spec change to varying packing in Vulkan is reverted and so is the SPIR-V validation change that enforced it. Bug: angleproject:404418769 Change-Id: I6eb82b8285121f65a4ac071ad6ede106dfe07988 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6661620 Reviewed-by: Yuly Novikov <ynovikov@chromium.org> Commit-Queue: Yuly Novikov <ynovikov@chromium.org> Auto-Submit: Shahbaz Youssefi <syoussefi@chromium.org>