Invitation letter generation

[marcoacierno]

What

ToDo

• Unit-tests
• Hotel reservation pdf? (Will do in a separate PR)
• Feature to send the invitation letter via email (Will do in a separate PR)
• Remove VariableNode
• Cleanup not_processed/not_processing
• Fix: https://python-italia.sentry.io/issues/6166309386/?project=1547999&query=is:unresolved%20issue.priority:%5Bhigh,%20medium%5D&sort=date&statsPeriod=14d&stream_index=3
• Fix: https://python-italia.sentry.io/issues/6166354561/?project=1547999&query=is:unresolved%20issue.priority:%5Bhigh,%20medium%5D&sort=date&statsPeriod=14d&stream_index=4 (migrations)

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Name	Status	Preview	Updated (UTC)
pycon	✅ Ready (Inspect)	Visit Preview	Dec 25, 2024 0:51am

[codecov]

Codecov Report

Attention: Patch coverage is 99.43343% with 2 lines in your changes missing coverage. Please review.

Project coverage is 94.39%. Comparing base (abf5430) to head (3e70e54).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4266      +/-   ##
==========================================
+ Coverage   94.15%   94.39%   +0.24%     
==========================================
  Files         332      341       +9     
  Lines        9231     9560     +329     
  Branches      636      658      +22     
==========================================
+ Hits         8691     9024     +333     
+ Misses        453      451       -2     
+ Partials       87       85       -2