CHORE(k8s): update PostgreSQL namespace reference

- Update PostgreSQL service namespace reference
- Fix database connection configuration

deploy/k8s/overlays/prod/externalsecret.yaml

@@ -35,11 +35,11 @@ spec:
   data:
     - secretKey: password
       remoteRef:
-        key: databases/postgresql-cnpg
+        key: databases/postgresql
         property: PASSWORD
     - secretKey: postgres-password
       remoteRef:
-        key: databases/postgresql-cnpg
+        key: databases/postgresql
         property: POSTGRES_PASSWORD
 ---
 apiVersion: external-secrets.io/v1beta1
@@ -57,6 +57,6 @@ spec:
   data:
     - secretKey: password
       remoteRef:
-        key: databases/postgresql-cnpg
+        key: databases/postgresql
         property: POSTGRES_PASSWORD