CTS/MCTS split for better together

-- add @FrameworkSpecificTest annotations to match @NonMainlineTest
-- AndroidTest.xml and AndroidTest-mcts.xml contain proper defaults
   for mode, exclude-annotations, etc.

Bug: 343583182
Bug: 331566031
Flag: TEST_ONLY
Test: atest CtsBetterTogetherTestCases
Test: atest MctsBetterTogetherTestCases
Merged-In: I180dec3e840a07f06c99f19462d1237f1d3b0f6e
Change-Id: I180dec3e840a07f06c99f19462d1237f1d3b0f6e
(cherry picked from commit 3c8f5a437fe06cc7feb060bb3831687eb095953f)