Exclude Grafana and Praefect database instances from the cloud-sql service

Pierre Guinoiseaurequested to merge
pguinoiseau/cloud-sql-exclude-grafana-praefect into master

So that we don't get 2 alerts instead of one for those services on transaction errors. The CloudSQL SLI definition in those services has some additional filters and metadata so they are useful to keep.

Corrective action for https://gitlab.com/gitlab-com/gl-infra/reliability/-/issues/15473

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