🔧 Permit many-arg test sigs in lint configs

Parametrized tests that also pull in pytest fixtures legitimately
end up with more than the default 5-arg cap that ruff, flake8
(wemake) and pylint all enforce.

`PLR0913` (ruff) is added to the `tests/**.py` per-file-ignores
in `.ruff.toml`; `WPS211` (wemake) is added to the equivalent
section in `.flake8`, alongside an updated rationale comment.
pylint's own `R0913` is left to be suppressed inline on the
specific test function where it fires; this project does not
currently trigger it but the lint configs are mirrored across
sibling tox_plugins.* projects for cross-project consistency.

Author: webknjaz

.flake8

@@ -104,8 +104,9 @@ per-file-ignores =
   # furthermore, we should be able to import and test private attributes
   # (WPS450) and modules (WPS436); `pytest.raises()` allows inspecting the
   # exception outside the CM (WPS441); additionally test docstrings don't
-  # need param lists (DAR, DCO020):
-  tests/**.py: DAR, DCO020, S101, S108, WPS430, WPS436, WPS441, WPS442, WPS450
+  # need param lists (DAR, DCO020); parametrized tests that also take
+  # pytest fixtures legitimately end up with many args (WPS211):
+  tests/**.py: DAR, DCO020, S101, S108, WPS211, WPS430, WPS436, WPS441, WPS442, WPS450
 
   tests/importable_test.py: ANN101, DAR
 

.ruff.toml

@@ -85,6 +85,7 @@ testing = [
   # these will need to be added to that line as well.
 
   "PLC2701", # Allow importing internal files needed for testing
+  "PLR0913", # Allow parametrized + fixture test signatures with many args
   "S101",    # Allow use of `assert` in test files
 ]