Merge "[AA+] Reset search manager when exiting all apps." into sc-dev am: e57006fe63 am: 450e821047

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14804874

Change-Id: I7bca06659f53815ae2fe2d255110e5e5d3bd4810