Make UnstableReconfiguratorState::target_blueprint non-optional
#9423
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UnstableReconfiguratorStates constructed from real systems always supplied a target blueprint, because real systems are required to always have one. We'd kept this as optional to allow forreconfigurator-cli's simulated system to not have a blueprint at all, but I'd like to make other changes related to thePlanningInputthat trip over this difference.This PR addresses the simulator side by having it claim to have a blueprint with the nil ID and containing nothing any time it's asked for the current list of blueprints or current target blueprint and one hasn't otherwise been set (i.e., by loading an example system or an existing serialized state).
(Staged on top of #9417)