Consider excluding options from CodeModel.get_model_state()

[edan-bainglass]

In the CodeModel class:

    def get_model_state(self) -> dict:
        return {
            "options": self.options,
            "code": self.selected,
            "nodes": self.num_nodes,
            "cpus": self.num_cpus,
            "ntasks_per_node": self.ntasks_per_node,
            "cpus_per_task": self.cpus_per_task,
            "max_wallclock_seconds": self.max_wallclock_seconds,
        }

I added the options field (in #946) surely for some reason, but it doesn't make much sense to me now. This issue is a reminder to revisit the code and see if the field is actually needed, and if possible (strongly suggested), remove it.