Add unit tests for Port and Node base classes - #122

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: armanrahman22/azblob-download-action@v0.0.4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/