Simplify postprocessor logging

[vbanos]

Define item_id once on logger init instead of calling it on each logger call.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 32.25806% with 21 lines in your changes missing coverage. Please review.
✅ Project coverage is 55.56%. Comparing base (dd277b0) to head (cca096e).
⚠️ Report is 69 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/pkg/postprocessor/item.go	33.33%	12 Missing ⚠️
internal/pkg/postprocessor/assets.go	30.76%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #424      +/-   ##
==========================================
+ Coverage   55.54%   55.56%   +0.01%     
==========================================
  Files         119      119              
  Lines        7289     7291       +2     
==========================================
+ Hits         4049     4051       +2     
  Misses       2916     2916              
  Partials      324      324              

Flag	Coverage Δ
e2etests	37.55% <29.03%> (+0.03%)	⬆️
unittests	31.86% <9.67%> (+<0.01%)	⬆️

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[NGTmeaty]

thanks!

[NGTmeaty]

thanks!