DM-53844: v30 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 90.31%. Comparing base (d519ebd) to head (4428b3c).
⚠️ Report is 3 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #227   +/-   ##
=======================================
  Coverage   90.31%   90.31%           
=======================================
  Files          51       51           
  Lines        5545     5545           
  Branches      540      540           
=======================================
  Hits         5008     5008           
  Misses        438      438           
  Partials       99       99           

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