Consume key gesture events after they are handled.

Modify tests to see if keys are consumed when a key shortcut is
pressed. Some exceptions where keys are not to be fully consumed are
cases like multi key combinations, caps lock key.
Bug: 443845653
Test: atest KeyGestureControllerTests
Flag: EXEMPT bugfix

Change-Id: Ife8993700d4e2ee9656654e82cfde4ba50d982e6