Test EnvironmentVariableFilter with an empty deny list

[sschuberth]

Please have a look at the individual commit messages for the details.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.03%. Comparing base (8bc47a4) to head (7192bfa).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #9605   +/-   ##
=========================================
  Coverage     68.03%   68.03%           
+ Complexity     1287     1285    -2     
=========================================
  Files           249      249           
  Lines          8826     8826           
  Branches        920      920           
=========================================
  Hits           6005     6005           
  Misses         2432     2432           
  Partials        389      389           

Flag	Coverage Δ
funTest-docker	64.96% <ø> (ø)
funTest-non-docker	33.31% <ø> (-0.14%)	⬇️
test-ubuntu-24.04	35.81% <ø> (ø)
test-windows-2022	35.79% <ø> (ø)

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