Refine updateFileSystem logging messages

[mpass99]

to be able to differentiate between the different errors that occur.

Closes #619

[codecov]

Codecov Report

Attention: Patch coverage is 30.00000% with 14 lines in your changes missing coverage. Please review.

Project coverage is 76.63%. Comparing base (8f819de) to head (66561e7).
Report is 4 commits behind head on main.

Files	Patch %	Lines
internal/api/runners.go	33.33%	12 Missing ⚠️
internal/nomad/api_querier.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #633      +/-   ##
==========================================
- Coverage   76.92%   76.63%   -0.30%     
==========================================
  Files          41       41              
  Lines        3498     3514      +16     
==========================================
+ Hits         2691     2693       +2     
- Misses        592      606      +14     
  Partials      215      215              

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[MrSerth]

Awesome, thank you! That's great to see and I really expect it will aid us in identifying further issues and prioritize them 💪