Merge "[AA+] Reset search manager when exiting all apps." into sc-dev am: e57006fe63 am: d60854919f am: 3b77fde991

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

Change-Id: I411f1b85c418a56ee8d4d3b43b5fd1bfb5bff2b0