fix app prediction service doesn't clean-up properly.

Currently new app prediction session will be created each time
launcher crashes, this introduces some memory impact since the
existing callbacks are not released after the crash.

The root cause being random UUID was used to create the session,
as a result app prediction service is not able to dedupe it with
against existing sessions.

Bug: 161391868
Test: manual
Change-Id: I937cdaa6081d2b85d27ee0192f6af7f197b8e102