Enable zarr backend testing in data tests [2]

[h-mayorquin]

Continuation of #1056. Now for the backend equivalence.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.44%. Comparing base (36464df) to head (015a15d).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1083   +/-   ##
=======================================
  Coverage   90.44%   90.44%           
=======================================
  Files         129      129           
  Lines        8055     8051    -4     
=======================================
- Hits         7285     7282    -3     
+ Misses        770      769    -1     

Flag	Coverage Δ
unittests	90.44% <100.00%> (+<0.01%)	⬆️

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Files with missing lines	Coverage Δ
src/neuroconv/basedatainterface.py	94.52% <ø> (ø)
...c/neuroconv/tools/testing/data_interface_mixins.py	95.57% <100.00%> (+0.10%)	⬆️