Include Targeting Information on outgoing telemetry

[rossgrambo]

Outgoing telemetry relied on some ambient property (like App Insights' User field) to connect published events to metrics. We should specifically use the UserId field used on the TargetingContext and name it more specifically 'TargetingId', since this can be used to target things besides users.

[jimmyca15]

Is there a PR that addressed this issue?

[rossgrambo]

Yes - #347 & #350