refactor(pytest_plugin): migrate session state to pytest.Stash

[ogenstad]

Why

Found when analyzing the codebase for areas where we could improve typing. Use a new pytest.Stash feature to allow for correct typing within our pytest plugin

What changed

• Migrate the pytest plugin's session state from dynamic attribute assignment to pytest.StashKey

[codecov]

Codecov Report

❌ Patch coverage is 96.55172% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
infrahub_sdk/pytest_plugin/items/check.py	50.00%	1 Missing ⚠️

@@                 Coverage Diff                  @@
##           infrahub-develop     #985      +/-   ##
====================================================
+ Coverage             81.43%   81.85%   +0.42%     
====================================================
  Files                   134      135       +1     
  Lines                 11359    11371      +12     
  Branches               1703     1702       -1     
====================================================
+ Hits                   9250     9308      +58     
+ Misses                 1566     1512      -54     
- Partials                543      551       +8     

Flag	Coverage Δ
integration-tests	41.86% <10.34%> (-0.05%)	⬇️
python-3.10	54.74% <48.27%> (+0.32%)	⬆️
python-3.11	54.74% <48.27%> (+0.32%)	⬆️
python-3.12	54.74% <48.27%> (+0.34%)	⬆️
python-3.13	54.76% <48.27%> (+0.34%)	⬆️
python-3.14	54.75% <48.27%> (+0.36%)	⬆️
python-filler-3.12	23.51% <96.55%> (+0.79%)	⬆️

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

Files with missing lines	Coverage Δ
infrahub_sdk/pytest_plugin/_stash.py	100.00% <100.00%> (ø)
infrahub_sdk/pytest_plugin/items/base.py	89.18% <100.00%> (+10.81%)	⬆️
infrahub_sdk/pytest_plugin/items/graphql_query.py	70.58% <100.00%> (+22.10%)	⬆️
...frahub_sdk/pytest_plugin/items/jinja2_transform.py	71.01% <100.00%> (+10.72%)	⬆️
...frahub_sdk/pytest_plugin/items/python_transform.py	68.51% <100.00%> (+8.14%)	⬆️
infrahub_sdk/pytest_plugin/loader.py	91.83% <100.00%> (+13.11%)	⬆️
infrahub_sdk/pytest_plugin/plugin.py	84.44% <100.00%> (-0.34%)	⬇️
infrahub_sdk/pytest_plugin/items/check.py	44.68% <50.00%> (+1.20%)	⬆️

... and 3 files with indirect coverage changes

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