[Ravenwood] Fully remove RavenwoodConfig support

At the same time, relax some RavenwoodRule checks since RavenwoodRule is
now just a normal JUnit rule.

Flag: EXEMPT host test change only
Bug: 377765941
Test: $ANDROID_BUILD_TOP/frameworks/base/ravenwood/scripts/run-ravenwood-tests.sh
Change-Id: Ia3f8afd61f8636f458e0eafae4b75139f5bc14b9