Simplify HTML extractor logging

[vbanos]

Define url and item once on logger init instead of calling them on each Warn and Debug call.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 20.00000% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 55.51%. Comparing base (dc1cc5b) to head (56a4dc9).
⚠️ Report is 120 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/pkg/postprocessor/extractor/html.go	20.00%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #417      +/-   ##
==========================================
+ Coverage   55.17%   55.51%   +0.34%     
==========================================
  Files         117      119       +2     
  Lines        7257     7304      +47     
==========================================
+ Hits         4004     4055      +51     
+ Misses       2935     2926       -9     
- Partials      318      323       +5     

Flag	Coverage Δ
e2etests	37.43% <20.00%> (-0.16%)	⬇️
unittests	31.88% <20.00%> (+0.74%)	⬆️

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[NGTmeaty]

Thanks!