Generating fake “to Recents” events for overview NOT from task

These records are required by “Transition Delay - Hot Launch From
Recents” test. It doesn’t look at transition times for this event. They
are just a part of its expected sequence of events.

I generate transition delay times as zeroes because no one is looking at
them.

Bug: 72967764
Test: atest google/perf/app-transition/app-transition-from-recents-trace
Change-Id: I4a5b76b95c6c4b54e7fb620951342a3ed8564aed