feat(medusa, medusa-js, medusa-react): Implement store complete order… (#2275)

**What**

Allow a customer to complete a requested order edit.

**Test**
- Unit tests complete flow
- Unit tests medusa react
- Integration tests of order edit completion

FIXES CORE-501

packages/medusa-react/mocks/handlers/store.ts

@@ -73,7 +73,23 @@ export const storeHandlers = [
     return res(
       ctx.status(200),
       ctx.json({
-        order_edit: {...fixtures.get("order_edit"), declined_reason: req.body.declined_reason, status: 'declined'},
+        order_edit: {
+          ...fixtures.get("store_order_edit"),
+          declined_reason: (req.body as any).declined_reason,
+          status: "declined",
+        },
+      })
+    )
+  }),
+
+  rest.post("/store/order-edits/:id/complete", (req, res, ctx) => {
+    return res(
+      ctx.status(200),
+      ctx.json({
+        order_edit: {
+          ...fixtures.get("store_order_edit"),
+          status: "confirmed",
+        },
       })
     )
   }),