Use mock home and monkeypatch ssh parser for ssh config testing

[unkcpz]

Part of #516

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (a1b5134) 79.39% compared to head (936de4f) 79.97%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #523      +/-   ##
==========================================
+ Coverage   79.39%   79.97%   +0.57%     
==========================================
  Files          27       27              
  Lines        3849     3830      -19     
==========================================
+ Hits         3056     3063       +7     
+ Misses        793      767      -26     

Flag	Coverage Δ
python-3.10	79.97% <92.85%> (+0.57%)	⬆️
python-3.8	80.01% <92.85%> (+0.57%)	⬆️
python-3.9	80.01% <92.85%> (+0.57%)	⬆️

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Files	Coverage Δ
aiidalab_widgets_base/computational_resources.py	69.84% <100.00%> (-0.18%)	⬇️
tests/test_computational_resources.py	100.00% <100.00%> (ø)
tests/test_structures.py	100.00% <100.00%> (ø)
aiidalab_widgets_base/structures.py	77.99% <83.33%> (+3.10%)	⬆️

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