Automate ingestion regression tests for devnet

- data download from devnet
- configure prometheous/grafana
- add missing metrics to make it easy to compare with ([ops metrics](https://grafana.dev.global.canton.network.digitalasset.com/d/dec17fpqzdwcge/splice-stores-ingestion?orgId=1&from=now-24h&to=now&timezone=UTC&var-namespace=sv&var-node_name=scan-app&var-store_name=DbScanStore&var-store_party=$__all&refresh=10s))
- new GHA workflow