Fixes for nested fields and filters before and after fetching data

[gutzbenj]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 30.00000% with 77 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.47%. Comparing base (a6f6986) to head (8a0f36f).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/koality/executor.py	19.35%	75 Missing ⚠️
src/koality/checks.py	88.23%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #60      +/-   ##
==========================================
- Coverage   84.18%   79.47%   -4.72%     
==========================================
  Files           7        7              
  Lines        1094     1179      +85     
==========================================
+ Hits          921      937      +16     
- Misses        173      242      +69     

Flag	Coverage Δ
unittests	79.47% <30.00%> (-4.72%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.