Go home before getting overview in test to ensure overview will exist.

Also when opening settings, do not wait for A11Y event which never fires. (added in ag/24777489, but seems to fail as mentioned here b/303329286#comment2 and tracked here b/298114205)

Fix: 307379525
Fix: 307397957
Bug: 298114205
Flag: ACONFIG com.android.launcher3.enable_overview_icon_menu TRUNKFOOD
Test: TaplOverviewIconTest
Change-Id: Icd8a47b47d22ddb32db7df6882ec655f0e6f54c1