Vulkan: Remove RenderPassSerial RenderPassSerial was introduced to uniquely identify a RenderPassCommands. With the work of per current context queue serial, now every started RenderPassCommands already have a unique QueueSerial. This CL removes RenderPassSerial and use renderPass's queueSerial instead. Bug: b/255414841 Change-Id: Id0a87319a9132cdb74aba195f1f05aa31454592b Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4049966 Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Commit-Queue: Charlie Lao <cclao@google.com> Reviewed-by: Yuxin Hu <yuxinhu@google.com>