feat(core-flows,dashboard): adds item validations for claims, returns and exchanges (#8735)

what:

- adds item validations for claims, returns and exchanges
- prevents autofocus on item add
- reset item quantity when error

integration-tests/http/__tests__/exchanges/exchanges.spec.ts

@@ -427,6 +427,30 @@ medusaIntegrationTestRunner({
           },
           adminHeaders
         )
+
+        const { response } = await api
+          .post(`/admin/exchanges/${exchangeId2}/request`, {}, adminHeaders)
+          .catch((e) => e)
+
+        expect(response.data).toEqual({
+          type: "invalid_data",
+          message:
+            "Order exchange request should have atleast 1 item inbound and 1 item outbound",
+        })
+
+        await api.post(
+          `/admin/exchanges/${exchangeId2}/outbound/items`,
+          {
+            items: [
+              {
+                variant_id: productExtra.variants[0].id,
+                quantity: 2,
+              },
+            ],
+          },
+          adminHeaders
+        )
+
         await api.post(
           `/admin/exchanges/${exchangeId2}/request`,
           {},