Finalize ORM 3 Support

[mbabker]

This should be the last bit that's needed to finish out #2708.

• Needs Run tests without doctrine/annotations installed #2781 to merge first to be able to build on the CI architecture (it's blowing up pretty badly right now because of the presence of doctrine/annotations and the auto-detection code in our Gedmo\Mapping\MappedEventSubscriber class) Handled in the testing bootstrap instead
• I haven't even looked at the PHPStan report yet, that can be dealt with once we have consistent green PHPUnit builds Baseline refreshed

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.79%. Comparing base (0632ab1) to head (067365a).
Report is 39 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2814      +/-   ##
==========================================
+ Coverage   78.75%   78.79%   +0.04%     
==========================================
  Files         163      167       +4     
  Lines        8593     8629      +36     
==========================================
+ Hits         6767     6799      +32     
- Misses       1826     1830       +4     

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[franmomu]

Thank you @mbabker for all the work you're doing!