add descendant fields to entity class for denormalized_nodes

[kevinschaper]

For use in the node hierarchy display

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[codecov]

Codecov Report

❌ Patch coverage is 97.50000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 71.84%. Comparing base (2cd348c) to head (a1a5c69).
⚠️ Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
backend/tests/fixtures/entity.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1201      +/-   ##
==========================================
- Coverage   72.07%   71.84%   -0.23%     
==========================================
  Files          92       92              
  Lines        3255     3232      -23     
==========================================
- Hits         2346     2322      -24     
- Misses        909      910       +1     

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