Move getGearSelectionVerifierBuilder and getCurrentGearVerifierBuilder to VehiclePropertyVerifiers

This allows for common test logic to be shared between CTS and ATS.

Bug: 394182625
Test: atest CarPropertyManagerTest
Flag: TEST_ONLY
Change-Id: I3dcf1c4b3e0ac25cceab84ff0de0697a15f81f4c
2 files changed