Option to configure the Headlamp Prometheus source in helm chart

[dirkckau]

In particular Headlamp Pod/Deployment/Statement page, there is a graph to display the resource usage. In certain Kubernetes cluster environments where multiple Prometheus instances serve different purposes, could the Headlamp helm chart offers a configuration option to specify the desired Prometheus instance for Headlamp's query?

In our environment, we met an issue that Headlamp is always query from a wrong Prometheus and we couldn't see a way to configure it.