[data processing] Allow job binaries to be edited

*For Liberty*
Currently there is no way to edit a job binary. If a path needs
to be changed, for example, the job binary must be deleted and a new
one created. The most common use case is a situation where a user
creates a job binary, runs a job, and receives an error from the job
because the path does not exist. Although it is not strictly necessary,
editable job binary objects would be a convenience when a user needs to
correct a path or credentials.