DM-47673: Add 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 82.45%. Comparing base (c5ebe59) to head (93f9749).
Report is 3 commits behind head on v28.0.x.

Additional details and impacted files

@@           Coverage Diff            @@
##           v28.0.x     #184   +/-   ##
========================================
  Coverage    82.45%   82.45%           
========================================
  Files           41       41           
  Lines         3483     3483           
  Branches       356      353    -3     
========================================
  Hits          2872     2872           
  Misses         521      521           
  Partials        90       90           

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