Update release notes for moving to main

[andrewballantyne]

Updates the release notes to reflect the current state.

Follows up on #2847 and adds more details

[openshift-ci]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.47%. Comparing base (711e5e1) to head (785c30d).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2852   +/-   ##
=======================================
  Coverage   77.47%   77.47%           
=======================================
  Files        1103     1103           
  Lines       23213    23213           
  Branches     5857     5857           
=======================================
  Hits        17985    17985           
  Misses       5228     5228           

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