Implement playbook to refresh dashboards on existing Grafana server

[sync-by-unito]

It may be necessary to provide a new version of the proxy dashboard at any time to users with additional graphs or changes to the existing ones.

At the moment, the only monitoring-related playbook installs the whole monitoring stack (Prometheus, Grafana and Prom Node Exporter). As any Ansible playbook it is idempotent, so it can be run again and things that have already been done and do not need to change will be left as they are, but it still takes time.

It would be nice to have a playbook that allows you to just refresh the Grafana dashboards, skipping all the other steps.

This should be relatively easy to do, using only the necessary functionality from the Grafana Ansible role that already exists in the automation.

┆Issue is synchronized with this Jira Improvement by Unito
┆Components: Automation
┆Priority: Major