Add base scenario test for window minimize on app open.

Video recording of the CUJ test: b/339583422#comment2

Bug: 339583422
Test: atest MinimizeWindowOnAppOpen
Flag: com.android.window.flags.enable_desktop_windowing_mode
Change-Id: I64d20706b51e673191afc4f14a5fd1d36f38c8d6