DM-54588: v30.0.6 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 62.04%. Comparing base (a0c68f5) to head (f5907ac).
⚠️ Report is 2 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #56   +/-   ##
=======================================
  Coverage   62.04%   62.04%           
=======================================
  Files          18       18           
  Lines         656      656           
  Branches       71       71           
=======================================
  Hits          407      407           
  Misses        226      226           
  Partials       23       23           

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