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 86.82%. Comparing base (8ddb459) to head (47b61c5).
Report is 3 commits behind head on v28.0.x.

Additional details and impacted files

@@           Coverage Diff            @@
##           v28.0.x     #100   +/-   ##
========================================
  Coverage    86.82%   86.82%           
========================================
  Files           27       27           
  Lines         4630     4630           
  Branches       563      563           
========================================
  Hits          4020     4020           
  Misses         466      466           
  Partials       144      144           

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