TestMouseWheelReadConsoleInputHelper tests are flaky

In the InputTests, there are a handful of them that inject mouse events into the window handle.

They center around the method TestMouseWheelReadConsoleInputHelper.

They tend to fail when there are two input events in the queue instead of just the one they expect.

My theory is that the extra event in the queue is a focus or unfocus event.

We should make them all more robust to the point where they don't care/skip excess focus/unfocus events.