AML: Enable log and trace for non-process-switch launch

It will be more convenient to measure the generic launch
time by system or event log.

MetricsLogger, StatsLog, LaunchObserver still only focus
on process-switch launch.

Bug: 132736359
Bug: 144570280
Test: atest ActivityMetricsLoggerTests# \
            testLaunchTimeEventLogNonProcessSwitch

Change-Id: I2ed45677cbf41dc15938e0fad909cb66fb6ac2c3