When DB instances are deleted via RHODA, AWS might not update the status of the DB instances to be deleting promptly.

As a result, when the RDS provider account sync with AWS, these DB instances could be imported by RHODA again.

When syncing the RDS provider account, RHODA should check if any imported DB instances are in deleting state and not found from AWS. These imported DB instances should be deleted RHODA while syncing the RDS provider account.