feat: update mapping functions to include region and improve error handling

stackit/internal/services/postgresflexalpha/database/mapper.go

@@ -21,7 +21,7 @@ func mapFields(
 		return fmt.Errorf("id not present")
 	}
 	if model == nil {
-		return fmt.Errorf("model input is nil")
+		return fmt.Errorf("model given is nil")
 	}
 
 	var databaseId int64
@@ -36,6 +36,7 @@ func mapFields(
 	model.Id = types.Int64Value(databaseId)
 	model.Name = types.StringPointerValue(source.Name)
 	model.Owner = types.StringPointerValue(cleanString(source.Owner))
+	model.Region = types.StringValue(region)
 
 	return nil
 }