Communication channel between GC service and sockets

[pcrespov]

We need a way to sync communication between websockets. We know there is a embedded features in socketio that allows connecting to a message broker to do so... and seems the way to go.

A use case is e.g. enforce logout (i.e. socket channel disconnect) from a task in the GC service, which has no direct communication with the front-end!

NOTE: search fro this issue number in the code base to find contreat examples

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1. ✨🐛Webserver: enable socketio horizontal scaling + ensure only 1 update goes through (⚠️ devops) #4286
   a:webserver +1
   

[pcrespov]

Can use similar method as the one developed in #2410

[sanderegg]

@pcrespov what do you want to communicate exactly?