DM-44569: v27 release notes

[timj]

Checklist

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.25%. Comparing base (b95e90d) to head (ab26f16).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #291      +/-   ##
==========================================
- Coverage   87.29%   87.25%   -0.04%     
==========================================
  Files          50       50              
  Lines        4589     4576      -13     
  Branches      787      787              
==========================================
- Hits         4006     3993      -13     
  Misses        421      421              
  Partials      162      162              

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