text: Title: Export confirm page does not show the list of fields to be exported
  Body: **Describe the bug**
  
  Import workflow shows the list of fields that will be imported for each resource:
  
  ![image](https://github.com/django-import-export/django-import-export/assets/6249838/2b1625df-8639-456b-acd3-8a2debfff1ca)
  
  However the export workflow does not show this:
  
  ![image](https://github.com/django-import-export/django-import-export/assets/6249838/f957ea01-fdb1-44ec-8c3c-860a3051828b)
  
  
  **To Reproduce**
  
  Click on 'Export' button for the Book model.
  
  
  **Versions (please complete the following information):**
   - Django Import Export: 3.3.3
   - Python 3.11
   - Django 4.2
  
  **Expected behavior**
  
  A list of fields should be presented to the user for each resource on export.
  
  