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 94.61%. Comparing base (ea95089) to head (ec63fc9).
⚠️ Report is 3 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #236   +/-   ##
=======================================
  Coverage   94.61%   94.61%           
=======================================
  Files          51       51           
  Lines        3883     3883           
=======================================
  Hits         3674     3674           
  Misses        209      209           

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