Feature/fix aft test duration

[bicarbon8]

• fixes TestResult.metadata.durationMs value when testFunction doesn't exist or hasn't been run
• uses test scope to set TestResult.metadata.durationMs in external reporter classes as the value would otherwise be 0
• includes verify message argument in result returned from verify function on both passing and failing instead of just on failing so the TestResult.resultMessage submitted will include this value to help disambiguate multiple results from verify calls that succeed