[4/n] Implement LetterboxObservable Tests
Implement a Type Safe Builder for testing TransitionObservable and use it for testing LetterboxObservable. Flag: com.android.window.flags.app_compat_refactoring Bug: 370997904 Test: atest WMShellUnitTests:LetterboxTransitionObserverTest Change-Id: Ib36170c1ca621f37dd717686aa41b4256d417f98
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