Add release notes for 4.0-preview1

[ericstj]

Formatted and sorted list of PRs. I only exclude those which were part of 3.0 or 3.1.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.82%. Comparing base (f6ddd9b) to head (76532d5).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7064      +/-   ##
==========================================
- Coverage   68.82%   68.82%   -0.01%     
==========================================
  Files        1255     1255              
  Lines      250358   250358              
  Branches    25550    25550              
==========================================
- Hits       172307   172301       -6     
- Misses      71440    71444       +4     
- Partials     6611     6613       +2     

Flag	Coverage Δ
Debug	68.82% <ø> (-0.01%)	⬇️
production	63.25% <ø> (-0.01%)	⬇️
test	88.51% <ø> (ø)

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see 2 files with indirect coverage changes

[ericstj]

Merging this as the last one of the old format. Moving forward we can just use github's autogenerated format for these.