add test for pytest plugin python transform test

[wvandeun]

related to #433

if you rebase this branch on stable, the test fails (as expected)
if you rebase on pog-transform-node-argument, the test succeeds

needs to be rebased on stable when #433 has been merged

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

@@            Coverage Diff             @@
##           stable     #435      +/-   ##
==========================================
- Coverage   76.18%   75.28%   -0.90%     
==========================================
  Files         101       93       -8     
  Lines       10761     8567    -2194     
  Branches     2302     1680     -622     
==========================================
- Hits         8198     6450    -1748     
+ Misses       1937     1659     -278     
+ Partials      626      458     -168     

Flag	Coverage Δ
integration-tests	34.41% <0.00%> (-1.26%)	⬇️
python-3.10	47.71% <50.00%> (-1.46%)	⬇️
python-3.11	47.74% <50.00%> (-1.43%)	⬇️
python-3.12	47.71% <50.00%> (-1.44%)	⬇️
python-3.13	47.71% <50.00%> (-1.44%)	⬇️
python-3.9	46.38% <50.00%> (-1.38%)	⬇️
python-filler-3.12	25.03% <100.00%> (+1.24%)	⬆️

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Files with missing lines	Coverage Δ
...frahub_sdk/pytest_plugin/items/python_transform.py	61.53% <100.00%> (+22.32%)	⬆️

... and 16 files with indirect coverage changes

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