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

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

Change-Id: I81789f4281e4d3d595e1d1564826da786e42f355