fix(rds): use CustSubscriptionId instead of CustomerAwsId for event subscriptions

The loadEventSubscription function was incorrectly using CustomerAwsId
(AWS account ID) instead of CustSubscriptionId (subscription name) as the
resource identifier. This caused import failures when the account ID was
used as the subscription name in Terraform operations.

Fixes event subscription import errors where AWS would reject the account
ID as an invalid subscription identifier.

Author: Ronan Doolan

providers/aws/rds.go

@@ -213,7 +213,7 @@ func (g *RDSGenerator) loadEventSubscription(svc *rds.Client) error {
 			return err
 		}
 		for _, eventSubscription := range page.EventSubscriptionsList {
-			resourceName := StringValue(eventSubscription.CustomerAwsId)
+			resourceName := StringValue(eventSubscription.CustSubscriptionId)
 			g.Resources = append(g.Resources, terraformutils.NewSimpleResource(
 				resourceName,
 				resourceName,