Restore initial resolution after VirtualDisplayUtilWin teardown.

Adds some improvements to VirtualDisplayUtilWin:
1) Deletes copy constructors
2) Adds basic detection of an display mismatch when the driver is
   unloaded to verify that the utility has not changed the default
   display(s) which would impact subsequent tests running on the host.
3) Sets the dummy headless display to 1024x768 to better match the
   default Windows resolution.
4) Adds code to restore the resolution that existed when the class
   was constructed.
5) Adds a small DisplayConfigWaiter class to help with waiting for a
   desired config to become detected.

Bug: 341931537
Change-Id: Ib1ea14f55e201f0d0d41c94994c07e3c4eac7660
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5589945
Commit-Queue: Brad Triebwasser <btriebw@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Mike Wasserman <msw@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1312332}