Switch to eslint-plugin-n

[Windvis]

eslint-plugin-node has been unmaintained for a while now. The repo owner is unresponsive to requests for adding extra maintainers to the repo, as can be seen in these issues:

• Invitation to move to official eslint-community org mysticatea/eslint-plugin-node#341
• looking for maintainers? mysticatea/eslint-plugin-node#300

The wider ecosystem is switching to eslint-plugin-n, which is a fork of the original package that is being maintained by the community. I think we should also switch to that package in the blueprints (and probably ember-cli itself as well).