branch-4.1: [improve](streaming-job) add per-job lag metric to streaming insert jobs #63194#63271
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…obs (#63194) ### What problem does this PR solve? Related PR: #62224 (per-job metrics), #62269 (Lag column) Problem Summary: #62224 introduced per-job metrics (`streaming_job_per_job_scanned_rows`, `_load_bytes`, `_filtered_rows`, `_succeed_task_count`, `_failed_task_count`) for streaming insert jobs, exposed via `/metrics` with `job_id`/`job_name` labels for Prometheus. #62269 later added a `Lag` column to `SHOW JOBS` / `jobs()` TVF that reports end-to-end CDC delay in seconds, but the value was only exposed through SQL — there was no corresponding Prometheus metric, so dashboards/alerting on lag was not possible. This PR adds `streaming_job_per_job_lag` (unit: `SECONDS`) to the existing per-job metric set.
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Cherry-picked from #63194