[HealthChecks] TelemetryHealthCheckPublisher does not emit logs to ScriptHost/customer logs

[jviau]

TelemetryHealthCheckPublisher currently only emits logs to WebHost (Kusto) logs. We should emit these logs to customer logs as well.

This service lives in the WebHost, so importing ILogger does not give a logger for customers. To fix this, we will leverage keyed services and add a new ForwardingLogger which will emit to the active ScriptHost if it is available.