Override the ghw paths on ghw mock

[Itxaka]

When mocking the ghw stuff, we need to set the proper env var so the normal ghw scan looks at our mocked path instead.

On clean, we unset the var

This is so when using the mock, the ghw clone will pick up the env var and automatically set the paths pointing to it. This is useful for testing and was present on ghw as well, but now we can directly use it on our mock object so its done for us automatically

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 54.04%. Comparing base (64886b7) to head (b1ec6cc).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #496      +/-   ##
==========================================
+ Coverage   53.65%   54.04%   +0.38%     
==========================================
  Files          19       19              
  Lines        1558     1558              
==========================================
+ Hits          836      842       +6     
+ Misses        592      587       -5     
+ Partials      130      129       -1     

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