[E2E test] Ensure that opening app in DW limit should minimize the first opened app

Bug: 364589732
Flag: EXEMPT no flag is needed for instrumented test
Test: atest PlatformScenarioTests:com.android.wm.shell.functional.MinimizeWindowOnAppOpenTest

Change-Id: If2f513cc686704097971f51e814e58f1dd9e485e