Report a metric for each ran assertion including duplicate ones

So instead of reporting the failure count for each assertion, we report a metric for each time the assertion is run and just append an index to distinguish the assertions.

Bug: 281701890
Test: atest FlickerLibTest:FlickerServiceResultsCollectorTest
Change-Id: I92cede0329007114d27d7208ed72b3b9354fb34a
2 files changed