UpdateNetworkElement does only change the stored model, but not other data
Description
We want to also be able to change other data like the stored name of the MNE. This method needs to be adjusted to work with the plugin registry while providing the functionality described in the pervious sentence.
The update related definitions in the proto file for MNE should be updated, too.
New addition (2023/12/08): Also add this as an integration test aka call update and check if the changes went through.