fix(): Transform map (#13655)

**What**
It seems that for some reason the weak map fail in some scenario, but after investigation, the usage of map would not have a bad impact as it will be released after the Distributed transaction if finished. Therefore, falling back to Map instead

FIXES https://github.com/medusajs/medusa/issues/13654

NOTE: Waiting for the user feedback as he is also using node 18. We also use the exact same pattern in all our core flows without issues 🤔

packages/core/workflows-sdk/src/utils/composer/transform.ts

@@ -170,7 +170,7 @@ export function transform(
   } as WorkflowData & {
     __id: string
     __type: string
-    __temporary_storage_key: { key: string } | null
+    __temporary_storage_key: string | null
   }
 
   const returnFn = async function (
@@ -179,8 +179,7 @@ export function transform(
   ): Promise<any> {
     if ("transaction" in transactionContext) {
       const temporaryDataKey = `${transactionContext.transaction.modelId}_${transactionContext.transaction.transactionId}_${uniqId}`
-
-      ret.__temporary_storage_key ??= { key: temporaryDataKey }
+      ret.__temporary_storage_key ??= temporaryDataKey
 
       if (
         transactionContext.transaction.hasTemporaryData(