Add support for uploading slides in submissions

[marcoacierno]

• Slides upload WIP
• Finish files upload

[vercel]

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Name	Status	Preview	Updated (UTC)
pycon	❌ Failed (Inspect)		Jun 29, 2025 1:07pm

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.53%. Comparing base (d07501c) to head (af7bd53).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4425      +/-   ##
==========================================
+ Coverage   94.47%   94.53%   +0.05%     
==========================================
  Files         351      352       +1     
  Lines       10036    10130      +94     
  Branches      710      734      +24     
==========================================
+ Hits         9482     9576      +94     
  Misses        461      461              
  Partials       93       93              

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[sentry]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ GraphQLError: value too long for type character va... in production

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