Separate GraphQL Grafana dashboard
Currently, the only view onto GraphQL we have in Grafana is the [`api: Rails Controller` dashboard](https://dashboards.gitlab.net/d/api-rails-controller/api-rails-controller?orgId=1&var-controller=GraphqlController&var-action=All). This aggregates over all GraphQL queries. We should probably have more fine-grained views for this, since the characteristics for different queries could be very different. ## Proposal Add a dashboard that will be placeholder for GraphQL-related panels. Start with a single text panel describing what the dashboard is used for, reference the [GraphQL API observability blueprint](https://docs.gitlab.com/ee/architecture/blueprints/graphql_api/). Add a second panel with GraphQL controller / execute action request rate per second.
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