porting findutils testing to use uutests

[hz2]

closes #537

[hz2]

creating a draft to get feedback before porting all tests

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.66%. Comparing base (69b32a9) to head (aeb2429).
⚠️ Report is 74 commits behind head on main.

Additional details and impacted files

@@ Coverage Diff @@ ## main #541 +/- ## ========================================== + Coverage 87.49% 87.66% +0.17%  ========================================== Files 31 31 Lines 6815 6893 +78 Branches 321 324 +3 ========================================== + Hits 5963 6043 +80  + Misses 621 617 -4  - Partials 231 233 +2 

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[sarnobat]

@hz2 - are you still working on this? I'd like to know if you have the bandwidth to collaborate with me or whether it's better I just contribute directly.

[sarnobat]

@hz2 - are you still working on this? I could try to resolve the conflicts but if you're not in a place to contribute, I'll do it independently.

[sylvestre]

@sarnobat please go ahead