DM-47673: v28 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 89.73%. Comparing base (3abcffb) to head (7473eac).
Report is 3 commits behind head on v28.0.x.

Additional details and impacted files

@@           Coverage Diff            @@
##           v28.0.x     #313   +/-   ##
========================================
  Coverage    89.73%   89.73%           
========================================
  Files           50       50           
  Lines         4522     4522           
  Branches       414      414           
========================================
  Hits          4058     4058           
  Misses         340      340           
  Partials       124      124           

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