[nodes] Fix GetParentFolder node

[Alxiice]

Description

We don't necessarily want to check for original file existence.

Note

Example:
GetParentFolder("/my/path/to/images/image.%04d.exr")
Will return an empty string because image.%04d.exr is a fileseq
We want to return /my/path/to/images

So for now I just use the simple version, if we want to add more options for file checking we can add them later.

[gemini-code-assist]

Code Review

This pull request refactors the GetParentFolder node to use the os module instead of pathlib.Path and adds logging for non-existent parent paths. The review feedback recommends retaining pathlib.Path as it is more modern and idiomatic. Furthermore, using os.path.dirname on a simple filename can result in an empty string, triggering a false warning when checking if the path exists, which is resolved by sticking to pathlib.Path.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.38%. Comparing base (6f4fdcd) to head (8775c79).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #3122   +/-   ##
========================================
  Coverage    85.38%   85.38%           
========================================
  Files           73       73           
  Lines        11406    11406           
========================================
  Hits          9739     9739           
  Misses        1667     1667           

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