Use a completely separate adapter for yarn

[bertdeblock]

Builds on #1025.

This separates the yarn-specific logic from the npm-specific logic.
This also introduces a BaseAdapter class to get rid of duplication and ensure more consistency among adapters.

[codecov]

Codecov Report

Attention: Patch coverage is 97.43590% with 3 lines in your changes missing coverage. Please review.

Project coverage is 95.44%. Comparing base (324be12) to head (c46951f).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/dependency-manager-adapters/base.js	97.56%	2 Missing ⚠️
lib/utils/dependency-manager-adapter-factory.js	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1026      +/-   ##
==========================================
+ Coverage   94.96%   95.44%   +0.48%     
==========================================
  Files          18       21       +3     
  Lines         556      505      -51     
==========================================
- Hits          528      482      -46     
+ Misses         28       23       -5     

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