Backup Management: No 'Delete from storage' action on backup inventory

*User Impact:*

User is not able to delete backup from storage via UI

*Steps to Reproduce:*
#1 Prepare MySQL | MongoDB backup env
#2 Add service
#3 take a  backup of the service

#4 navigate to http://127.0.0.1/graph/backup/inventory
*Actual Result:*
You should see only 2 icons at Actions column :

1. Create Backup
2. Restore from Backup

*Expected Result:*

You should see 3 icons in Actions column :

1. Create Backup
2. Restore from Backup
3. Delete from storage