chore: try out new zarr codec pipeline

[ilan-gold]

• Closes #
• Tests added

• Release note not necessary because:

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.84%. Comparing base (6f84e04) to head (283f6e0).
⚠️ Report is 8 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/anndata/tests/helpers.py	33.33%	2 Missing ⚠️
src/anndata/__init__.py	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2529      +/-   ##
==========================================
- Coverage   87.71%   85.84%   -1.87%     
==========================================
  Files          49       49              
  Lines        7758     7808      +50     
==========================================
- Hits         6805     6703     -102     
- Misses        953     1105     +152     

Files with missing lines	Coverage Δ
src/anndata/__init__.py	82.14% <83.33%> (+0.32%)	⬆️
src/anndata/tests/helpers.py	83.79% <33.33%> (-9.38%)	⬇️

... and 12 files with indirect coverage changes