[ReAct] Lock for sub-actions in top-action

• Since this would be a bit hard to coordinate between the actions, the prefetch of the top-action could be made to call the prefetch of the sub-action. Maybe by pre-calculating the data the sub-action would be called with to create custom action_data.
• The execute_other action method could then be given a parameter telling the sub-action to not call prefetch because all prefetching for this action is guaranteed to already have happened in the top-action.
• We might have to turn prefetch into a class method, because otherwise we will have to create a class instance by hand every time we do this. We’re already doing that during execute_other_action, we don’t need that in the prefetch as well.

Start by tracing the ReAct prefetch flow and the execute_other action method, focusing on how top-actions invoke sub-actions. Determine how prefetch data and the proposed skip signal should move through that call chain. Done means the top-action coordinates sub-action prefetching and execution does not repeat work.