Make SSE optional

Assigning and waiting for parent issue to be fixed.

Parent issue was merged.

It would be better to add this option in the ActiveUsers islands. True by default.

SSE is activated only if the current profile has this island attached and the config is true.

Took it quickly as I wanted to do it to not have side effects in tests until follow up are not fixed.

Automatically closed - issue fixed for 2 weeks with no activity.