Add OpenAI cost tracking dashboard
This MR adds OpenAI cost tracking dashboard.
Testing:
cd dashboards
./test-dashboard.sh cloud-cost/open_ai.dashboard.jsonnet
Installed https://dashboards.gitlab.net/dashboard/snapshot/VdqHS0Rb7V6gKZTqD47yq4p8wS5o0DYz?orgId=1 - cloud-cost: OpenAI Cost Tracking
Partially depends on gitlab-org/gitlab!119346 (merged) but doesn't block this MR. Since we can have dashboard ready before we public the metrics.
Mentions https://gitlab.com/gitlab-org/gitlab/-/issues/407334
Edited by George Koltsov