Add artifact file with all Flicker status and assertion data for easier debugging.

When running Flicker as a Service in large test suite without failing the underlying test when a flicker is detected, the log message contain information about the reason for the failure is almost always out of the logcat buffer so we can't easily debug the flicker.

Bug: 319084789
Change-Id: I5ea2288ba45715da09d65ebc87674a84cdda6e41