DM-38552: (hotfix) Stop relying on current working directory in repr test

[timj]

The file URIs could urlencode some components of the path.

The test is not a good test. repr() tests rarely are.

Checklist

• ran Jenkins
• added a release note for user-visible changes to doc/changes

[codecov]

Codecov Report

Patch coverage: 98.81% and project coverage change: +0.05 🎉

Comparison is base (400db07) 87.72% compared to head (9aecccd) 87.77%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #815      +/-   ##
==========================================
+ Coverage   87.72%   87.77%   +0.05%     
==========================================
  Files         267      268       +1     
  Lines       34767    34935     +168     
  Branches     7316     7345      +29     
==========================================
+ Hits        30498    30665     +167     
  Misses       3116     3116              
- Partials     1153     1154       +1     

Impacted Files	Coverage Δ
python/lsst/daf/butler/delegates/arrownumpydict.py	91.66% <91.66%> (ø)
python/lsst/daf/butler/formatters/parquet.py	93.67% <100.00%> (+0.70%)	⬆️
tests/test_datastore.py	99.53% <100.00%> (ø)
tests/test_parquet.py	99.13% <100.00%> (+0.14%)	⬆️

... and 1 file with indirect coverage changes

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