Merge "[AA+] Reset search manager when exiting all apps." into sc-dev am: e57006fe63 am: 285c50740a

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

Change-Id: I7a24cc58459a66bb582caeb37e74758e014be0f6