(chore): remove zstd note in zarr v3 guide

[ilan-gold]

• Hooray pending the release of zstd failure for unsepcified buffer size zarr-developers/numcodecs#424, we don't have to worry about this anymore
• Tests added
• Release note added (or unnecessary)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.52%. Comparing base (2082898) to head (86830d7).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2024      +/-   ##
==========================================
- Coverage   87.52%   85.52%   -2.00%     
==========================================
  Files          46       46              
  Lines        7062     7062              
==========================================
- Hits         6181     6040     -141     
- Misses        881     1022     +141     

see 7 files with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.