When performing actions such as renaming a workflow or updating its
settings, n8n errors with "Failed to save workflow version" in the
console although the saving process was successful. We are now correctly
checking whether `nodes` and `connections` exist and only then save a
snapshot.
Github issue / Community forum post (link here to close automatically):
* 🔧 Adjust base ESLint config
* 🔧 Adjust `lint` and `lintfix` in `nodes-base`
* 🔧 Include `test` and `utils` in `nodes-base`
* 📘 Convert JS tests to TS
* 👕 Apply lintfixes
