Detect when workspace is off and using --disable-autostart

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When this happens we can display "the workspace is off" and ideally a button to turn it on, although I am not sure we can add buttons to an existing dialog window so maybe we will just have to error and say to turn it on then try again.

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At worst we could just pop up a second action dialog. That would make it work during the reconnect flow, too, since we should do it there as well not just in the initial connection.