[26/n] Adding tests to AppCompatReachability* classes

Flag: EXEMPT refactor
Bug: 336807329
Test: atest WmTests:AppCompatReachabilityPolicyTest
Test: atest WmTests:AppCompatReachabilityOverridesTest

Change-Id: I88a589f36631ea9244580ec6f9488ba21d5a5473
9 files changed