Fix problem in stats watcher

[joselsegura]

Description

StatsWatcher class now is an EngineWatcher, so it receives on_extract events. The current implementation is buggy, as it expects to receive always an Insights "extractor" object (one of TarExtractor or ZipExtractor). But currently the MultiplexorEngine, for example, is providing a different object (tarfile.TarFile) with a different interface.

The new implementation takes into account those differences

Fixes #CCXDEV-12836

Type of change

• Bug fix (non-breaking change which fixes an issue)

Testing steps

New unit tests

Checklist

• pre-commit run -a passes
• updated documentation wherever necessary
• added or modified tests if necessary
• updated schemas and validators in insights-data-schemas in case of input/output change

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.10%. Comparing base (2bfb4a0) to head (9b6a660).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #221      +/-   ##
==========================================
+ Coverage   85.38%   86.10%   +0.72%     
==========================================
  Files          34       34              
  Lines        1197     1209      +12     
==========================================
+ Hits         1022     1041      +19     
+ Misses        175      168       -7     

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