Implement previously connected device UI

* For fix the conflicts in pi-dev, cherry pick the commit 86d3e58c8d in
master and merge the conflict.
* Add @SearchIndexable in
PreviouslyConnectedDeviceDashboardFragment.java
* Move save device group to "Previously connected devices" preference

Bug: 74134939
Test: make -j60 RunSettingsRoboTests
Change-Id: Iff7894033df402d42dcc0ccaea6db3106edb7013
Merged-In: Iff7894033df402d42dcc0ccaea6db3106edb7013