There are several queueSubmit related members of RendererVk that can be
accessed from multiple threads. Adding mutex around thoses accesses
resolves race condition flagged by TSAN.

Add stress test for QueueSerial handling
Add test to catch race issue in garbage collection found by TSAN.

Test:
    angle_end2end_tests MultithreadingTest.MultiContextDrawWithSwapBuffers
    angle_end2end_tests MultithreadingTest.MultiContextCreateAndDeleteResources

Bug: b/168744561
Change-Id: I238cce9052476710778a3b35f8531891d90ddd6e
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2415402
Commit-Queue: Courtney Goeltzenleuchter <courtneygo@google.com>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Tim Van Patten <timvp@google.com>