Introduce a more thorough clean method

[niosus]

Before we would only clean cmake cache and that operation would regularly fail due to a bug in the code. This PR allows to clear all internal cache including the temporary folders generated before.

[codecov]

Codecov Report

❌ Patch coverage is 27.27273% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.31%. Comparing base (3b16eb1) to head (58faf01).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
plugin/view_config/view_config_manager.py	16.66%	5 Missing ⚠️
plugin/flags_sources/cmake_file.py	50.00%	2 Missing ⚠️
plugin/utils/tools.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #767      +/-   ##
==========================================
- Coverage   82.16%   81.31%   -0.86%     
==========================================
  Files          39       39              
  Lines        3319     3328       +9     
==========================================
- Hits         2727     2706      -21     
- Misses        592      622      +30     

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