fix(medusa): remove changes when deleting order edits (#2420)

**What**
- when deleting an OE cloned items are deleted, this would fail if there were changes associated with the OE since line items were referenced from the item changes and couldn't be deleted

**How**
- when deleting an order edit also remove it's item changes

Fixes CORE-689

packages/medusa/src/services/order-edit.ts

@@ -787,6 +787,15 @@ export default class OrderEditService extends TransactionBaseService {
     )
     const clonedItemIds = clonedLineItems.map((item) => item.id)
 
+    const orderEdit = await this.retrieve(orderEditId, {
+      select: ["id", "changes"],
+      relations: ["changes"],
+    })
+
+    await this.orderEditItemChangeService_.delete(
+      orderEdit.changes.map((change) => change.id)
+    )
+
     await Promise.all(
       [
         taxProviderServiceTs.clearLineItemsTaxLines(clonedItemIds),