Add a test case to validate that manually generated diagnostic constants have the same value between CarService and Vehicle HAL

Bug: 64024685
Test: runtest -x packages/services/Car/tests/carservice_test/src/com/android/car/test/CarDiagnosticConstantsTest.java
Change-Id: I934324dbe82ba94efed9e773202e1aca3d512bbc
2 files changed