[dawn][d3d] Adds loop for WaitForMultipleObjects with INFINITY.

- Adding the loop addresses the reverted workaround.
- Also includes a small fix for potential race in spontaneous
  event handling.
- Re-enables all the related tests now that they seem to be
  passing fine now on the arm64 Qualcomm devices with this fix.
- Also reverts "Fix MapAsyncAndWait use-after-free"
  commit 37905ab50503cb442aac9a8a28ac7306416dee39.

Original change's description:
> Fix MapAsyncAndWait use-after-free
>
> Fixes an issue where the callback registered in
> DawnTestBase::MapAsyncAndWait could cause an access violation during
> global test teardown due to trying to run a callback that was allocated
> on the stack and had already gone out of scope. This only occurred when
> instance.WaitAny() timed out, which would cause the callback to still
> be around until the instance got destroyed and ensured that all pending
> callbacks were complete.
>
> Now, the actual callback to run is provided via a shared_ptr and the
> lambda provided to buffer.MapAsync() checks if it is null before running
> it. After instance.WaitAny() returns but before we make any asserts, we
> set the pointer to null, preventing the soon-to-be-dangling pointer from
> being used in the future.
>
> This is meant as a temporary workaround, as WaitAny() should always run
> the provided callback. This can be reverted once the underlying issue
> is fixed.
>
> Bug: 459864803, 460743383
> Change-Id: I5384e74ff6ab9da6104b07e6d9d235bf5d4b40c2
> Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/273736
> Commit-Queue: Brian Sheedy <bsheedy@google.com>
> Reviewed-by: Loko Kung <lokokung@google.com>
> Auto-Submit: Brian Sheedy <bsheedy@google.com>
> Reviewed-by: Kai Ninomiya <kainino@chromium.org>

Bug: 459864803, 460743383, 461837996, 469328928, 465497435
Change-Id: Iabf26a66fbd6c92bf788a283c05b64d72e6f12ee
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/277975
Reviewed-by: Brian Sheedy <bsheedy@google.com>
Commit-Queue: Kai Ninomiya <kainino@chromium.org>
Auto-Submit: Loko Kung <lokokung@google.com>
Commit-Queue: Loko Kung <lokokung@google.com>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>