fix(medusa-payment-stripe): Catch on idempotency key retrieve if not found (#4025)

**What**
In case the idempotency key is not found, an error will be thrown. We actually want to catch this error and create the key if it does not exists

packages/medusa-payment-stripe/src/api/utils/__fixtures__/container.ts

@@ -35,8 +35,8 @@ container.register(
     withTransaction: function () {
       return this
     },
-    retrieve: jest.fn().mockReturnValue(undefined),
-    create: jest.fn().mockReturnValue({}),
+    retrieve: jest.fn().mockImplementation(async () => undefined),
+    create: jest.fn().mockImplementation(async () => ({})),
   })
 )
 

packages/medusa-payment-stripe/src/api/utils/utils.ts

@@ -226,10 +226,12 @@ async function completeCartIfNecessary({
 
     const idempotencyKeyServiceTx =
       idempotencyKeyService.withTransaction(transactionManager)
-    let idempotencyKey = await idempotencyKeyServiceTx.retrieve({
-      request_path: "/stripe/hooks",
-      idempotency_key: eventId,
-    })
+    let idempotencyKey = await idempotencyKeyServiceTx
+      .retrieve({
+        request_path: "/stripe/hooks",
+        idempotency_key: eventId,
+      })
+      .catch(() => undefined)
 
     if (!idempotencyKey) {
       idempotencyKey = await idempotencyKeyService