Handle redirect when accessing unreachable remote instances through the immersive editor

[cstns]

Description

with the immersive view, one can now access the editor when the device is in a non-working.
ex url: http://<host>/device/<instance-id>/overview

three edge cases to consider:

• the device does not have the developer mode enabled and the url is accessed directly
• the device has developer mode enabled but the tunnel is not started / not connected and the url is accessed directly
• the user is on the immersive device editor and the connection gets disconnected by
  • the tunnel gets disconnected / closed
  • the remote instance is switched to fleet mode

in all cases the user should get redirected to the device overview page and get a system toast.