test(sim-links): import the macrotask helper from its own module

Author: waleedlatif1

apps/sim/app/workspace/[workspaceId]/home/components/message-content/components/message-sources/message-sources.test.tsx

@@ -2,7 +2,7 @@
  * @vitest-environment jsdom
  */
 import { act } from 'react'
-import { flushMacrotask } from '@sim/testing'
+import { flushMacrotask } from '@sim/testing/helpers/async'
 import { QueryClient, QueryClientProvider } from '@tanstack/react-query'
 import { createRoot, type Root } from 'react-dom/client'
 import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'