Deduplicate grafana SQL alerts

Summary

The grafana cloudsql database is tracked twice. Once as an SLI on the grafana service and once on the generic cloud-sql service.

This leads to duplicate alerts.

We should consider dropping the grafana cloudsql instance from the cloud-sql service.

Related Incident(s)

Originating issue(s): production#6639 (closed)

Desired Outcome/Acceptance Criteria

We only get a single alert when there are issues with the grafana database.

Associated Services

Corrective Action Issue Checklist

• Link the incident(s) this corrective action arose out of
• Give context for what problem this corrective action is trying to prevent from re-occurring
• Assign a severity label (this is the highest sev of related incidents, defaults to 'severity::4')
• Assign a priority (this will default to 'priority::4')