Add Code Suggestions to Metrics Catalog

Requires gitlab-org/modelops/applied-ml/code-suggestions/ai-assist!79 (merged). For https://gitlab.com/gitlab-com/gl-infra/reliability/-/issues/23636.

Add code suggestions service to metrics catalog to generate SLIs, service overview dashboard, and structured logging links.

How To Test

1. Follow setup instructions in https://gitlab.com/gitlab-com/runbooks/-/tree/master/dashboards#obtain-the-grafana-playground-api-key.
2. Run the following command in dashboards directory:

$ source .env.sh && ./test-dashboard.sh ./code_suggestions/main.dashboard.jsonnet

Example Dashboard

https://dashboards.gitlab.net/dashboard/snapshot/BmADADIeKRep6purv8Q7d8Xn3kMw7oR4

The recordings are currently missing, those are being added here. The SLI-details rows are still empty because they need the environment label: gitlab-org/modelops/applied-ml/code-suggestions/ai-assist!84 (merged)