Update item_mapper to perform case-insensitive duplicate barcode detection for items

[bltravis]

Closes #738

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov]

Codecov Report

Attention: Patch coverage is 94.11765% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 71.94%. Comparing base (927072f) to head (718357a).

Files	Patch %	Lines
...n_tools/mapping_file_transformation/item_mapper.py	87.50%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #758      +/-   ##
==========================================
+ Coverage   71.90%   71.94%   +0.04%     
==========================================
  Files         103      103              
  Lines       11392    11395       +3     
  Branches     1366     1366              
==========================================
+ Hits         8191     8198       +7     
+ Misses       2904     2901       -3     
+ Partials      297      296       -1     

Flag	Coverage Δ
unittests	71.94% <94.11%> (+0.04%)	⬆️

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