This diff removes `.gitignore` file in the `rust-node-addon` and adds ignoring directories to the global `.gitignore` file at the root of the project. It makes sense to use a root gitignore file to ignore these two directories.
Linear task: [[ https://linear.app/comm/issue/ENG-3048/getting-rust-node-addon-error-when-running-yarn-cleaninstall | ENG-3048 ]]