handle duplicated files on export

[kkoehn]

handles duplicated files (primarily imported task with multi referenced file) during the export to avoid the duplication on export

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.77%. Comparing base (7b8e35f) to head (91e643a).
⚠️ Report is 12 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2119      +/-   ##
==========================================
+ Coverage   94.76%   94.77%   +0.01%     
==========================================
  Files         134      134              
  Lines        3421     3429       +8     
==========================================
+ Hits         3242     3250       +8     
  Misses        179      179              

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