test(fs): do not write files in source tree during test

[jbronder]

This pull request addresses the issue of files and directories being created and written into the source tree while testing functions in the fs package. Creation of temporary directories were incorporated into the existing tests where applicable.

Fixes #5358 .

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.34%. Comparing base (b1b8279) to head (652ba92).
Report is 35 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6236      +/-   ##
==========================================
- Coverage   96.52%   96.34%   -0.18%     
==========================================
  Files         534      547      +13     
  Lines       40976    41661     +685     
  Branches     6134     6313     +179     
==========================================
+ Hits        39551    40138     +587     
- Misses       1383     1481      +98     
  Partials       42       42              

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[kt3k]

LGTM. Thanks for your contribution! Also thanks for looking into the errors on windows