Refactor/Fix/Update `tech_to_dispatch_connections`

From PR #615 by @kbrunik

I understand that this isn't the point of this PR but it illuminated to me that we have some weird logic in the plant_config. I vote that we potentially make an issue about it.
I think it's ambiguous that it says "tech_to_dispatch_connections" but excludes the open-loop controllers. I vote either we update this name to be more clear that this isn't used for open loop dispatch or we add all dispatch to the "tech_to_dispatch_connections". We also need to spell this out in documentation. It's currently not included.

Originally posted by @kbrunik in https://github.com/NatLabRockies/H2Integrate/pull/615#discussion_r2976853100

I also think that this is partially related to the differences between the Heuristic Pyomo controller and the Optimized Pyomo controller.

Start by inspecting the plant_config logic and comparing the Heuristic Pyomo and Optimized Pyomo controllers, especially how open-loop dispatch is handled. Resolve whether tech_to_dispatch_connections should be renamed or expanded to include all dispatch, then document the chosen behavior and its distinction from the controllers.