[PUI] Sub builds table

[SchrodingersGat]

• Add filter to display "cascading" child builds
• Add "level" attribute to build serializer
• Code cleanup

[netlify]

✅ Deploy Preview for inventree-web-pui-preview ready!

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Lighthouse	1 paths audited Performance: 100 (no change from production) Accessibility: 86 (no change from production) Best Practices: 92 (no change from production) SEO: 70 (no change from production) PWA: - View the detailed breakdown and full score reports

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[codecov]

Codecov Report

Attention: Patch coverage is 80.95238% with 4 lines in your changes missing coverage. Please review.

Project coverage is 83.48%. Comparing base (a7d9600) to head (5e12f70).
Report is 311 commits behind head on master.

Files with missing lines	Patch %	Lines
src/backend/InvenTree/build/api.py	70.00%	3 Missing ⚠️
src/frontend/src/tables/InvenTreeTable.tsx	75.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7932      +/-   ##
==========================================
+ Coverage   83.43%   83.48%   +0.04%     
==========================================
  Files        1130     1130              
  Lines       50382    50394      +12     
  Branches     1745     1746       +1     
==========================================
+ Hits        42038    42069      +31     
+ Misses       7886     7871      -15     
+ Partials      458      454       -4     

Flag	Coverage Δ
backend	85.20% <75.00%> (-0.01%)	⬇️
pui	65.26% <88.88%> (+0.25%)	⬆️

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