UI : Show the Backup repository as column in Backup offerings view

### The required feature described as a wish

Currently, if there are multiple back up repository in Cloudstack

Its difficult to identify the backup offerings associated with the backup repository from the UI.

Expected behaviour

It would be great if the backup column is added to the backup offerings view

also the backup repoistory is mentioned as External id (uuid) it would be great if the backup reposistory name is mentioned

https://cloudstack.apache.org/api/apidocs-4.22/apis/listBackupRepositories.html
https://cloudstack.apache.org/api/apidocs-4.22/apis/listBackupOfferings.html

Start with the listBackupRepositories and listBackupOfferings API documentation linked in the issue, then locate the Backup Offerings view and determine how its current repository identifier is populated. Done means the view shows a backup repository column with the repository name, rather than only its external ID, for offerings associated with multiple repositories.

Written by the indexing model from the issue text.