Adds grafana dashboards (#21806)

.changelog/21806.txt

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+```release-note:feature
+grafana: added the dashboards service-to-service dashboard, service dashboard, and consul dataplane dashboard
+```

grafana/README.md

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-# Grafana Publishing
-
-The page for publishing this dashboard is https://grafana.com/grafana/dashboards/13396
-
-## How to edit and Publish
-    - Start grafana locally (consul-docker-test/mesh-gateways-l7 will provide you two Consul DCs, grafana, and prometheus)_
-    - Import the dashboard json into a new dashboard
-    - Make changes
-    - Click "share" and export for external publishing
-    - Login to Grafana via the team account (message a manager)
-    - Publish as a new version, including change notes.
-
-### Grafana dashboard for consul-k8s (control plane)
-
-A grafana dashboard for monitoring consul-k8s (control plane) can also be found in this directory: `consul-k8s-control-plane-monitoring.json`. This dashboard has not been published to https://grafana.com.