delete unit_tests/node.sh
delete unit_tests/node.sh

The file is no longer used in `package.json` and `README.md`.


Former-commit-id: e189e45ad318b2f9393c3ba50645d85f07dd6ddf [formerly 21c0077c75eefdea01785a8c007c63cdd35dde97]
Former-commit-id: f61a399246d815d0a46af21636db5727ad66b108
andrewplummer/Sugar,romancow/Sugar,romancow/Sugar,andrewplummer/Sugar