[API] Sales order filters

[SchrodingersGat]

• Fixes for SalesOrderLineItem API endpoints
• Improvements to PUI tables
• Updated unit testing

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.28%. Comparing base (cb0248d) to head (7ff7ceb).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8331      +/-   ##
==========================================
+ Coverage   84.23%   84.28%   +0.04%     
==========================================
  Files        1166     1166              
  Lines       52884    52929      +45     
  Branches     1942     1942              
==========================================
+ Hits        44546    44610      +64     
+ Misses       7855     7841      -14     
+ Partials      483      478       -5     

Flag	Coverage Δ
backend	85.92% <100.00%> (+0.02%)	⬆️
pui	66.85% <100.00%> (+0.16%)	⬆️

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[matmair]

LGTM;
Random though: Do you think we could dynamically load the filters (including translations) from the backend? Would reduce duplication.

[SchrodingersGat]

@matmair some of the translated labels for the filters are already introspected from the API - any filter which directly matches an available field in the API endpoint can use the translated string from that field