DM-51073: v29.1 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 35.83%. Comparing base (17389a3) to head (48e928e).
Report is 3 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #91   +/-   ##
=======================================
  Coverage   35.83%   35.83%           
=======================================
  Files          10       10           
  Lines         946      946           
  Branches      155      155           
=======================================
  Hits          339      339           
  Misses        597      597           
  Partials       10       10           

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