Provision Grafana configuration via Terraform
Using the [Grafana provider](https://registry.terraform.io/providers/grafana/grafana/latest/docs), we can use Terraform to provision: - dashboards - folders - datasources - teams And we can also leverage the [Jsonnet provider](https://registry.terraform.io/providers/alxrem/jsonnet/latest/docs). It would make: - dashboards provisioning way faster and easier to cleanup (currently done with a script synchronizing one by one very slowly) - folders less hidden (currently created manually by that same sync script and slow) - datasources easier than done currently in `tanka-deployments` and with better secret management - teams no longer manual and more visible Which repository should it be managed in? - [config-mgmt](https://ops.gitlab.net/gitlab-com/gl-infra/config-mgmt) - [runbooks](https://gitlab.com/gitlab-com/runbooks) - its own separate repository for everything Grafana
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