tests: bench: chmod after reflink on macos

[efiop]

No description provided.

[codecov-commenter]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (5e37397) 64.51% compared to head (ebfd4a0) 63.40%.

Files	Patch %	Lines
tests/benchmarks/test_fs.py	62.50%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #236      +/-   ##
==========================================
- Coverage   64.51%   63.40%   -1.12%     
==========================================
  Files          27       27              
  Lines        2046     2052       +6     
  Branches      324      325       +1     
==========================================
- Hits         1320     1301      -19     
- Misses        666      692      +26     
+ Partials       60       59       -1     

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[efiop]

We should not be doing chmodding in linking at all, but rather a layer above during checkout where we know desired permissions. https://github.com/iterative/dql/pull/1007#issuecomment-1841951977

[skshetry]

In #237, I have _reflink that does not do any chmod, and it's usually faster than pyreflink.