observability(runway): add artifact-registry-gke Jobs dashboard

Adds the Jobs dashboard for artifact-registry-gke: 17 panels in 5 rows (throughput, duration and in-flight, enqueue path, storage-accounting drains, reconciliation), on the service's gitlab_artifact_registry_jobs_*, counter-drain, and reconciliation metric families across both job backends (River on Postgres, asynq on Redis).

Preview: https://dashboards.gitlab.net/d/jpereira-verify-ar-jobs (playground upload of this exact build; staging shows live data on the throughput, duration, enqueue, drain, and backlog panels; the fault panels are born on first fault and their descriptions say No data is healthy).

Related to gitlab-org/ops/artifact-registry#354 (closed)

Edited by João Pereira

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