Add a CTS to test app override system button behaviors

Right now the CTS test only runs on watches to assert
KEYCODE_STEM_PRIMARY behaviors.

Bug: 308482931
Test: atest CtsInputTestCases:OverrideSystemKeyBehaviorTest
Change-Id: Ib08bb1b38c05b2587486b8c777d9ddc098579e32
5 files changed