Add Custom Headers property to the monitorConfig property of TrafficManagerProfile

[iljaskevic]

Currently, "monitorConfig" property of the TrafficManagerProfile resource does not have custom header settings (https://learn.microsoft.com/en-us/azure/traffic-manager/traffic-manager-monitoring#configure-endpoint-monitoring) and does not configure it on the underlying Azure Traffic Manager profile.

We need to be able to set a custom header (ex. Host header) in order to make the health check work with Kubernetes ingress controller, which routes the requests based on the hostname.