AppLaunch: Update to support iorap compilations on go/perfmaster

Use the new 'iorap_trial_launch' boolean flag to use iorap.
When iorap is enabled, it adds 3 extra trial launches to collect
perfetto traces and then compile it into an iorap prefetch file.

Test: am instrument -w -r  -e iorap_trial_launch true -e \
      trace_iterations 2 -e debug false -e apps "Calculator^Calculator" -e \
      launch_directory /sdcard -e compiler_filters 'speed-profile' -e \
      trial_launch true -e trace_directory sdcard -e log false -e drop_cache \
      true -e required_accounts com.google -e timeout_msec 300000 -e \
      launch_order CYCLIC -e launch_iterations 5 \
      com.android.tests.applaunch/android.test.InstrumentationTestRunner
Bug: 150880186
Change-Id: Ibc0a39e04dd671aa3d6fa5fca086251e622a5235