feat: allow to download model generated files other than images

[tomtobac]

Description

It fixes citations, other than images, that are to be skipped for "encode". It checks if they have any output files and allows downloads.

Closes TLK-789

Screenshots

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 74.83%. Comparing base (eeec651) to head (d033a7c). Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #725   +/-   ##
=======================================
  Coverage   74.83%   74.83%           
=======================================
  Files         262      262           
  Lines       11531    11531           
=======================================
  Hits         8629     8629           
  Misses       2902     2902           

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