Expose FileInput.uploaded_label

[philippjfr]

Fixes #697

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.09%. Comparing base (ed899ca) to head (0c0054e).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #708       +/-   ##
===========================================
+ Coverage   71.27%   85.09%   +13.82%     
===========================================
  Files          33       33               
  Lines        3850     3851        +1     
===========================================
+ Hits         2744     3277      +533     
+ Misses       1106      574      -532     

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