REFACTOR: Pathlib icepack.py

[jvela018]

Issue linked

#5180

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[codecov]

Codecov Report

Attention: Patch coverage is 85.71429% with 1 line in your changes missing coverage. Please review.

Project coverage is 85.05%. Comparing base (8239f21) to head (6caee6d).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5973      +/-   ##
==========================================
- Coverage   85.06%   85.05%   -0.01%     
==========================================
  Files         163      163              
  Lines       62780    62781       +1     
==========================================
  Hits        53401    53401              
- Misses       9379     9380       +1     

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