Add more tests for program list and radio manager

Added more unit tests for program list and radio manager. Reduced
timeout value for tuner adapter unit tests to 500 ms. Used mocked
context instead to remove InstrumentationRegistry from program
list unit test.

Bug: 262583864
Test: atest android.hardware.radio
Change-Id: I4c09f82ff1a59b6331d4d036f8b34c447b1fe36b