chore(event-bus-*): Do not emit if no subscribers: (#14084)

* chore(event-vus-*): Do not emit if no subscribers:

* Create curly-apricots-double.md

* add tests

* align tests

integration-tests/modules/__tests__/cart/store/cart.completion.ts

@@ -1021,7 +1021,7 @@ medusaIntegrationTestRunner({
               eventGroupId
             ) ?? []
 
-          expect(grouppedEventBefore).toHaveLength(1)
+          expect(grouppedEventBefore).toHaveLength(17)
           expect(grouppedEventAfter).toHaveLength(0) // events have been compensated
 
           expect(errors[0].error.message).toBe(