feat: restructure events payload (#8143)

* refactor: restructure events payload

Breaking change: This PR changes the event payload accepted by the event
listeners

* refactor: fix failing tests and implement feedback

* add integration tests

* fix timeout

---------

Co-authored-by: Adrien de Peretti <adrien.deperetti@gmail.com>

packages/medusa/src/api/hooks/payment/[provider]/route.ts

@@ -21,7 +21,7 @@ export const POST = async (req: MedusaRequest, res: MedusaResponse) => {
     // we delay the processing of the event to avoid a conflict caused by a race condition
     await eventBus.emit(
       {
-        eventName: PaymentWebhookEvents.WebhookReceived,
+        name: PaymentWebhookEvents.WebhookReceived,
         data: event,
       },
       {