Feature: DUPLICATE report status to disambiguate UNUSED

[emmercm]

Fixes: #982

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (main@825d608). Click here to learn what that means.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1120   +/-   ##
=======================================
  Coverage        ?   93.14%           
=======================================
  Files           ?       92           
  Lines           ?     6129           
  Branches        ?     1469           
=======================================
  Hits            ?     5709           
  Misses          ?      419           
  Partials        ?        1           

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[github-actions]

🧪 Branch testing instructions

This pull request can be tested locally with the following command:

npm exec --yes -- "github:emmercm/igir#emmercm/report-duplicate-files" [commands..] [options]

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