feat(DAAC-456): Enable backup of databases to object store

[rjaduthie]

Features

This PR adds:

• Ansible role to create a backup job on the Onyx database VM
• Ansible added to the OpenTofu providers
• Configuration of a frequent (every 2 hours) backup and a daily backup, the former with 24 hours lifetime and the latter with 7 days lifetime
• Backup stored in OpenStack object store

Testing

Ansible applied from branch to the VM (using TF). Backup shown to be working using swift CLI:

$ swift list uksrc-backups
postgres-vm_caom_20260317_154113.sql.gz
postgres-vm_caom_20260317_154115.sql.gz
postgres-vm_caom_20260317_160016.sql.gz
postgres-vm_caom_preprod_20260317_154113.sql.gz
postgres-vm_caom_preprod_20260317_154115.sql.gz
postgres-vm_caom_preprod_20260317_160016.sql.gz
postgres-vm_postgres_20260317_154113.sql.gz
postgres-vm_postgres_20260317_154115.sql.gz
postgres-vm_postgres_20260317_160016.sql.gz
postgres-vm_software_discovery_20260317_154113.sql.gz
postgres-vm_software_discovery_20260317_154115.sql.gz
postgres-vm_software_discovery_20260317_160016.sql.gz
postgres-vm_software_discovery_preprod_20260317_154113.sql.gz
postgres-vm_software_discovery_preprod_20260317_154115.sql.gz
postgres-vm_software_discovery_preprod_20260317_160016.sql.gz

... extra backups here were created when the service started, then the frequent backup at 1600 was also created.