Add RavenwoodBivalentTest to ravenwood-presubmit.

There are already many TEST_MAPPING files added which will be active. https://cs.android.com/search?q=%22ravenwood-presubmit%22%20filepath:test_mapping&sq= This change adds more trigger paths for RavenwoodBivalentTest, and removes the unused "postsubmit-ravenwood" suite.

Bug: 350545439
Change-Id: I6bd54b26272eb7b751b2ba909d3f62e8e6512211
Flag: EXEMPT refactor