Vulkan: Support VK_KHR_image_format_list for RenderBuffers RenderBuffers are now created with VK_KHR_image_format_list extension support enabled. We only enable those tests where the EGL image's source is a RenderBuffer but not those tests where the EGL image's target is a RenderBuffer. There are some corner cases related to glReadPixles that need to be resolved to unblock those tests. Bug: angleproject:3756 Bug: angleproject:5281 Test: ImageTest.SourceRenderbuffer*Vulkan Change-Id: I643a9d74d14473cc7df59fa6e25acab7d1c9aad1 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2528475 Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Commit-Queue: Mohan Maiya <m.maiya@samsung.com>