Better file and multiprocessing error handling

[JuanPedroGHM]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 53.22581% with 29 lines in your changes missing coverage. Please review.

Project coverage is 63.77%. Comparing base (50553ff) to head (3759d13).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
perun/monitoring/monitor.py	57.77%	19 Missing ⚠️
perun/api/cli.py	0.00%	6 Missing ⚠️
perun/core.py	70.00%	3 Missing ⚠️
perun/monitoring/subprocess.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #151      +/-   ##
==========================================
- Coverage   64.18%   63.77%   -0.41%     
==========================================
  Files          31       31              
  Lines        2446     2493      +47     
==========================================
+ Hits         1570     1590      +20     
- Misses        876      903      +27     

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