Fix bug with accessing pytest.Package object in fixtures

It turned out, that request fixture might not contain required member and needed information are provided in different location.

def __get_pytest_package_object(request) -> Optional[pytest.Package]:
        assert request.scope == 'package'

>       pytest_scope = request.node.items[0]
E       AttributeError: 'Package' object has no attribute 'items'

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