deploy_sa.sh errors on line 70/71

### deploy_sa.sh errors on line 70/71

```
purview_data_curator_id=$(az role definition list --name "Purview Data Curator" --query "[].{name:name}" -o tsv)
purview_data_reader_id=$(az role definition list --name "Purview Data Reader" --query "[].{name:name}" -o tsv)
```

These Purview RBAC roles have been decommissioned and are no longer available. 