Display cancellation reason + disable cancellation form if event not …

[amandine-sahl]

cf #25

• Ajout donnée cancellationreason
• Bloquer l'annulation de l'animation si elle n'est pas annulée dans Geotrek

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.04 🎉

Comparison is base (4a9dc8a) 78.48% compared to head (0173bd1) 78.53%.

❗ Current head 0173bd1 differs from pull request most recent head b0a2fdf. Consider uploading reports for the commit b0a2fdf to get more accurate results

Additional details and impacted files

@@              Coverage Diff               @@
##           develop_v2      #26      +/-   ##
==============================================
+ Coverage       78.48%   78.53%   +0.04%     
==============================================
  Files              10       10              
  Lines             939      941       +2     
==============================================
+ Hits              737      739       +2     
  Misses            202      202              

Flag	Coverage Δ
pytest	78.53% <100.00%> (+0.04%)	⬆️

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Impacted Files	Coverage Δ
backend/core/models.py	94.20% <100.00%> (+0.11%)	⬆️
backend/core/schemas.py	89.71% <100.00%> (+0.50%)	⬆️

... and 2 files with indirect coverage changes

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