Add support for Azure Backups

[ianstanton]

Add support for Azure backup and restore in tembo-operator and conductor.

Conductor changes include steps for creating the Azure 'IAM' resources necessary for instances to perform backup / restore with Azure Blob Storage.

When an instance using Azure is created:

• Creates User Assigned Managed Identity
• Creates Role Assignment
• Creates Federated Credentials
• Passes relevant info as part of the CoreDB spec

When an instance using Azure is deleted:

• Deletes the User Assigned Managed Identity

Note: This only supports the backup archive bucket at the moment. We'll add support for the storage archive bucket as a follow-up

[ianstanton]

We need to add this spec value to the Cluster resource for Azure deployments:

  inheritedMetadata:
    labels:
      azure.workload.identity/use: "true"

I'll follow up with this shortly.