[META] Improved connection loss handling

[formerly luehrsFred]

This is not an easy problem as it can open vulnerabilities easily. If connection is broken to any external RPC then we must stop the state machine.
The team decided to handle it with better notifications for now to give a better user feedback.

Soft measurements:

• #7212
• #7211
• #7213

[Ulrich Petri]

One more option we discussed:

• Add a soft-restart feature that would allow the client to self restart from the outer layer (cli) in case of an exception, removing the need for the user to setup a process manager