Move ConnectToDeltaStream after we wait for the offline promise. Calling
ConnectToDeltaStream has side effects, like actually connecting to the
service, which is then visible to other clients. This in turn looks more
like a stalled client to other clients. A truly offline client wouldn't
have those side effects. This change re-orders the time we connect at to
ensure we don't have side effects until the offline client comes back
online and really connects.


[AB#5936](https://dev.azure.com/fluidframework/235294da-091d-4c29-84fc-cdfc3d90890b/_workitems/edit/5936)

Co-authored-by: Tony Murphy <[email protected]>