DevOps: Prod-test-restore job works with the new crunchy postgres cluter

[pbastia]

After our migration from patroni to the PostgresCluster object, we don't have direct access to the postgres WAL files on the backup server.
We'll have to come up with a different strategy for the cron-prod-test-restore job to work.
A beginning of a solution was developed by @dleard here: https://github.com/bcgov/cas-obps-postgres/tree/develop/test-backups

Other solution could be to try to do it in-place with https://access.crunchydata.com/documentation/postgres-operator/latest/tutorials/backups-disaster-recovery/disaster-recovery#cloud-based-data-source