Enable PIP flicker tests on tablet

1. Add API to check ignoreOrientationRequest flag
2. Provide starting display bounds by the flag
3. Re-open tests on tablet. Previously they were disabled by
   assumeFalse(tapl.isTablet)

Bug: 356277166
Test: atest EnterPipToOtherOrientation
Test: atest BottomHalfEnterPipToOtherOrientation
Flag: com.android.window.flags.better_support_non_match_parent_activity

Change-Id: I93de7f4c7ade77f3e733bd9df27a153c886636b1