gns3-server: disable test_project.py test (#440240)

Changed files
+1
pkgs
applications
networking
gns3
+1
pkgs/applications/networking/gns3/server.nix
···
disabledTestPaths = [
# fails on ofborg because of lack of cpu vendor information
"tests/controller/gns3vm/test_virtualbox_gns3_vm.py::test_cpu_vendor_id"
+
"tests/controller/test_project.py"
];
passthru.tests = {