Vulkan: Retire Command Buffers before destroying the Pools. "VulkanSecondaryCommandBuffer"s may be still in "CommandQueue" when "ContextVk" destroys the Command Pools (asyncCommandBufferReset = true). Fixed by calling "retireFinishedCommandsLocked()" when appropriate. Normally, it is only required to retire Vulkan Secondary Buffers. However, some drivers may have bug and also require to reset Primary Buffers, that have Secondaries recorded, before destroying the Secondaries Pools. Bug: angleproject:6811 Bug: angleproject:6100 Change-Id: I891547c95cfbdfab44398980f939596af56ab57b Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4350269 Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Commit-Queue: Igor Nazarov <i.nazarov@samsung.com> Reviewed-by: Charlie Lao <cclao@google.com>