fix: Abnormal mandatory attachment in Collaborative Drafts

[AyakorK]

🎩 Description

Please describe your pull request.

Removal of a useless override that we added in 0.26.7 and that is not useful as we are now in 0.27 and that the issue of a mandatory attachment came from this file.

📌 Related Issues

Link your PR to an issue

• Notion card

Testing

Describe the best way to test or validate your PR.

Example:

• Log in as admin
• Access Backoffice
• Go to a proposal settings
• Enable attachments
• Access this proposal
• Access to collaborative drafts
• Create a new collaborative draft without putting any attachment
• Check that you can create it without any error

Tasks

• Remove file
• Remove unused locales

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.51%. Comparing base (b48acd7) to head (390d973).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #512   +/-   ##
========================================
  Coverage    89.51%   89.51%           
========================================
  Files           68       68           
  Lines         1622     1622           
========================================
  Hits          1452     1452           
  Misses         170      170           

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