[14/n] Adding tests for AppCompatCamera

Implements tests for AppCompatCameraPolicy and
AppCompatCameraOverrides

Flag: EXEMPT refactor
Bug: 346253439
Test: atest WmTests:AppCompatCameraOverridesTest
Test: atest WmTests:AppCompatCameraPolicyTest
Test: atest WmTests:LetterboxUiControllerTest

Change-Id: I28605f0c90f209ed69eeed6a08defba0685464eb
5 files changed