Add WM Flicker Tests for App Compat

Tests for opening app in size compat mode and restarting it in size compat mode

Bug: 234498861
Test: atest WMShellFlickerTests:OpenAppInSizeCompatModeTest
Test: atest WMShellFlickerTests:RestartAppInSizeCompatModeTest
Change-Id: Iaaa44cfad8090639281e22077b0e7a9e3fe9a41b
7 files changed