refactor: use ScanResults.Inventory.Packages directly

[G-Rath]

... and finally we come to the end (sort of): now that PackageScanResults holds *extractor.Package, we can just switch to using Inventory.Packages directly 🎉

[codecov-commenter]

Codecov Report

❌ Patch coverage is 91.11111% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 67.94%. Comparing base (3553569) to head (e5fe803).

Files with missing lines	Patch %	Lines
pkg/osvscanner/filter.go	87.50%	1 Missing and 1 partial ⚠️
pkg/osvscanner/osvscanner.go	92.59%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2617      +/-   ##
==========================================
+ Coverage   67.72%   67.94%   +0.22%     
==========================================
  Files         173      173              
  Lines       13387    13389       +2     
==========================================
+ Hits         9066     9097      +31     
+ Misses       3606     3583      -23     
+ Partials      715      709       -6     

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