Top10 expensive fields in GraphQL dashboard
## Description We want to build a separate GraphQL Grafana dashboard, see https://gitlab.com/gitlab-com/gl-infra/scalability/-/issues/583. See GraphQL API Observability architectural blueprint https://docs.gitlab.com/ee/architecture/blueprints/graphql_api/. ## Proposal Add a panel with top 10 most expensive GraphQL fields, similarly to [top PostgreSQL queries dashboard](https://dashboards.gitlab.net/d/000000242/postgresql-top-queries): ![postresql_top_queries](/uploads/adeefb21a5eeb016e13e4b5875ffb395/postresql_top_queries.png) /cc @pslaughter @dsatcher @deuley
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