chore: 8.5.0 release notes

[ecormany]

Overview

Add release notes for 8.5.0 final alphas and stable.

Test Plan and Hands on Testing

Read the words here and then make sure they appear in alpha update flow.

Changelog

Bullets in the usual two spots.

Review requests

Anything missing? A cool bug fix we should call out?

Risk assessment

v low

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 23.73%. Comparing base (968ddc8) to head (6a17f37).

Additional details and impacted files

@@                   Coverage Diff                    @@
##           chore_release-8.5.0   #18744       +/-   ##
========================================================
- Coverage                54.65%   23.73%   -30.92%     
========================================================
  Files                     3258     3258               
  Lines                   281774   281756       -18     
  Branches                 29494    29463       -31     
========================================================
- Hits                    153999    66877    -87122     
- Misses                  127585   214853    +87268     
+ Partials                   190       26      -164     

Flag	Coverage Δ
app	2.30% <ø> (-45.00%)	⬇️

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see 1650 files with indirect coverage changes

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