Add retry mecanism around run_cmd

[edan-bainglass]

Our CI keeps failing due to likely transient network with fetching pseudos, particularly from the PseudoDojo family. This commit adds a retry mechanism around the run_cmd function to mitigate this issue.

[codecov]

Codecov Report

❌ Patch coverage is 30.76923% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.21%. Comparing base (a24b747) to head (7ce385b).

Files with missing lines	Patch %	Lines
src/aiidalab_qe/setup/pseudos.py	30.76%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1523      +/-   ##
==========================================
- Coverage   75.29%   75.21%   -0.08%     
==========================================
  Files         115      115              
  Lines        7367     7376       +9     
==========================================
+ Hits         5547     5548       +1     
- Misses       1820     1828       +8     

Flag	Coverage Δ
python-3.12	75.21% <30.76%> (-0.08%)	⬇️
python-3.9	75.24% <30.76%> (-0.08%)	⬇️

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[edan-bainglass]

Doesn't solve the issue. It is still unclear as to why the python -m aiidalab_qe download-pseudos command works seamlessly on local but fails nearly every time on remote (particularly for the PseudoDojo family).