Add Ambassador Dashboard on Grafana

[sownak]

Description

As a Network Operator I want to see Ambassador Proxy performance on Grafana so that I can monitor the calls made, rejections and other parameters.

Depends on #1416 and #1417

Addition context

https://www.getambassador.io/docs/edge-stack/latest/howtos/prometheus

Acceptance Criteria

1. Enable prometheus monitoring for Ambassador
2. Add Ambassador dashboard configured for organizations