Handle PermissionError gracefully during recursive search for upstream visits

[tieneupin]

In our actual production environment, the directories containing data will be interspersed with other directories that we don't have access to, which will lead to PermissionError occurences during the recursive search.

This PR nests the directory scanning logic in a try-except block, logging a warning of the directory that could not be accessed before safely moving on to try the other directories until the maximum depth set is reached.

[codecov]

Codecov Report

❌ Patch coverage is 77.77778% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 46.11%. Comparing base (a28e2fb) to head (7c9544c).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #731      +/-   ##
==========================================
+ Coverage   46.03%   46.11%   +0.07%     
==========================================
  Files          91       91              
  Lines        9638     9656      +18     
  Branches     1261     1265       +4     
==========================================
+ Hits         4437     4453      +16     
- Misses       4980     4981       +1     
- Partials      221      222       +1     

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