metrics tables seem to be deleted with `rerun` which breaks `--statistics-only`

[mikewilli]

Needs investigation, but based on jetstream_rerun DAG run https://workflow.telemetry.mozilla.org/dags/jetstream_rerun/grid?dag_run_id=manual__2025-10-02T16%3A18%3A05%2B00%3A00&task_id=jetstream_rerun&tab=logs this appears to be the case.

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