refactor(python): move tests into python/tests/ directory

Relocate all Python unit and E2E test files from python/ and python/e2e/
into python/tests/ and python/tests/e2e/ for better project organization.
Update pyproject.toml test paths accordingly.

Author: brettcannon

python/pyproject.toml

@@ -81,7 +81,7 @@ exclude = [
 ]
 
 [tool.pytest.ini_options]
-testpaths = ["."]
+testpaths = ["tests"]
 python_files = "test_*.py"
 python_classes = "Test*"
 python_functions = "test_*"