DM-53844: v30 release notes

[timj]

Checklist

• added documentation for a new migration script
• 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 59.00%. Comparing base (636f362) to head (26bbc48).
⚠️ Report is 4 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #54   +/-   ##
=======================================
  Coverage   59.00%   59.00%           
=======================================
  Files          40       40           
  Lines        1449     1449           
  Branches      169      169           
=======================================
  Hits          855      855           
  Misses        558      558           
  Partials       36       36           

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