chore(sqlalchemy): drop dead pyright exclude and ruff per-file-ignore for test_sqlalchemy

Two more pyproject.toml patterns surviving from PR #4340 that point at
files no longer on disk:

* ``[tool.pyright].exclude`` — ``tests/unit/test_contrib/test_sqlalchemy.py``
* ``[tool.ruff.lint.per-file-ignores]`` — ``tests/unit/test_contrib/test_sqlalchemy/**/*.*``

The single-file path and the directory-glob both matched zero files
once the contrib SQLAlchemy test suite was deleted alongside the
package. ``make lint`` (ruff, mypy, pyright, slotscheck) is clean
without them, confirming both patterns were unreachable. Same
dead-pattern cleanup as commits a4bd03c and 5494be3.

Author: cofin

pyproject.toml

@@ -333,7 +333,6 @@ exclude = [
   "litestar/plugins/pydantic/plugins/init.py",
   "litestar/plugins/pydantic/plugins/schema.py",
   "litestar/plugins/pydantic/dto_factory.py",
-  "tests/unit/test_contrib/test_sqlalchemy.py",
   "tests/unit/test_plugins/test_pydantic/test_openapi.py",
   "tests/unit/test_repository/test_generic_mock_repository.py",
   "**/node_modules/**",
@@ -497,7 +496,6 @@ known-first-party = ["litestar", "tests", "examples"]
   "UP045",
   "RUF043",
 ]
-"tests/unit/test_contrib/test_sqlalchemy/**/*.*" = ["UP006"]
 "tests/unit/test_openapi/test_typescript_converter/test_converter.py" = ["W293"]
 "tests/unit/test_typing.py" = ["UP006", "UP035"]
 "tools/**/*.*" = ["D", "ARG", "EM", "TRY", "G", "FBT"]