`OpenTAP.Diagnostic.Event.DurationNS` returns 0 on `OpenTAP.ILogListener` events

Related to 5G-VINNI, NatsLogListener.

NatsLogListener implements OpenTAP.ILogListener. As events come along TestPlan runs, it has been observed that the Event.DurationNS property is always 0.

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In a scenario like this, 100ms is part of the Event.Message, and the Event.DurationNS is 0.

Edited by Vivienne Spence