Vulkan: Add a test to triger large VAO dirty bit handling. Some traces bind one VBO to a large number of VAOs,this will cause glBufferData spending a lot of time doing VAO dirty bit handling,which leads to high cpu load in these traces.This test could triger this issue. Bug: angleproject:6371 Change-Id: Iedc6630b497cb0f62ea0129aefc19c717c3ef905 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3147173 Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Sunny Sun <sunny.sun@arm.com> Reviewed-by: Tim Van Patten <timvp@google.com> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>