BAEL-4643: JPA CascadeType.REMOVE vs orphanRemoval

* Adds a test to OrphanRemovalIntegrationTest that expects a PersistenceException

persistence-modules/java-jpa-3/src/main/java/com/baeldung/jpa/removal/OrderRequest.java

@@ -34,6 +34,10 @@ public class OrderRequest {
         lineItems.remove(lineItem);
     }
 
+    public void setLineItems(List<LineItem> lineItems) {
+        this.lineItems = lineItems;
+    }
+
     protected OrderRequest() {
     }
 }