AM: Fix invalid hot launch app metrics seen with quickstep

When quickstep is enabled, and the home button is pressed, AML receives two launches. The second
launch is always incomplete. When an activity is then launched, the Launcher activity is
treated as a trampoline activity and the launch will be reported as a hot launch with inflated
times.

The second launch is incomplete because we never get a window's drawn message for the second
launch. We solve this by keeping track of windows drawn state in the Activity Record. If an
activity is launched and its windows are already drawn, then we abort the launch metrics.

Test: manual test with quickstep
Test: atest ActivityMetricsLoggerTest
Bug: 119221454
Change-Id: Id34a1c42c9b2ea356757109fedf5e2a1a3b020c8
(cherry picked from commit c1d2ff60)