Update test build rules to support mocking AConfig methods.

- Add mockito-inline-extended to allow mocking static methods.
- Add StaticMockitoRule to help mock static methods.
This helps in unit tests with mocking the trunk stable flags.

Bug: 294913042
Test: NA
Flag: NA
Change-Id: If53ae1d1bc68a5c6b1824b6c7060cbc14e095b1b