[Bug]: Ensure RDS DB Instances have Encryption at-Rest Enabled-Unity

[LucaCinquini]

MCP ticket: https://jaas.gsfc.nasa.gov/servicedesk/customer/portal/2/GSD-5113

[LucaCinquini]

This should already be the case. In the Terraform module for RDS:

storage_encrypted = true

and see snapshot of a newly deployed system:

[LucaCinquini]

To complete this ticket we need to:
o redeploy: db:unity-test-sps-airflowdb-btl-6b5b
o delete: btl-dd6-dev-sps-spsdb