feat: Add email & name in proposals and surveys exports

[Quentinchampenois]

🎩 Description

Please describe your pull request.

• Lock wicked_pdf to 2.6.3 and add dedicated spec
• Ensure user email & name are exported only for registered answers
• Ensure author email & name are exported for proposals admin exports

📌 Related Issues

Link your PR to an issue

• Fixes Add an email column to proposal and form answers exports  #496
• Notion card

Testing

Describe the best way to test or validate your PR.

Example:

• Log in as admin

• Access Backoffice

• Export proposals

• Export surveys

• As a visitor

• Export open data

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.51%. Comparing base (7bc1f00) to head (4f72c84).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #510      +/-   ##
===========================================
+ Coverage    89.43%   89.51%   +0.08%     
===========================================
  Files           67       68       +1     
  Lines         1609     1622      +13     
===========================================
+ Hits          1439     1452      +13     
  Misses         170      170              

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