fix: osv-scanner json scans not matching with correct ecosystem

[another-rex]

Fixes #2139

Since osv-scalibr updated how Ecosystem is returned to be centralized, we need to add our own check in imodels to return the correct ecosystem.

Also:

• Removed extra functions in the extractor that's no longer needed
• Added a test for the regression.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 67.54%. Comparing base (0063082) to head (82dc63f).
⚠️ Report is 403 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2141      +/-   ##
==========================================
+ Coverage   67.49%   67.54%   +0.04%     
==========================================
  Files         171      171              
  Lines       16258    16255       -3     
==========================================
+ Hits        10974    10980       +6     
+ Misses       4608     4600       -8     
+ Partials      676      675       -1     

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