Standardize result identifiers to use "atmo.fnresult" between Atmo, Sat, and Compute Controlplane

[danielledeleo]

Atmo result messages are currently being sent across grav in a few different ways. Messages should use the "atmo.fnresult" constant to specify the message type and encode the rest of the runnable information with the existing sequence.FnResult type used in Sat and Atmo (in some places).

We don't want to do this anymore:

e.Send(grav.NewMsgWithParentID(fmt.Sprintf("local/%s", jobType), ctx.RequestID(), nil))