Fix paths with events on C++

[AJahueyM]

The latest updates that changed event markers to be time based caused paths with events to crash on C++.
When doing:

m_untriggeredEvents.insert(m_untriggeredEvents.end(),
  m_generatedTrajectory.getEventCommands().begin(),
  m_generatedTrajectory.getEventCommands().end());

A new vector is created each time m_generatedTrajectory.getEventCommands() is called, meaning that the iterators are not linked. I solved this by storing the eventCommands in a different variable and then getting the begin and end iterators from it. Another solution could maybe be changing PathPlannerTrajectory::getEventCommands to return a constant reference to the events.

[mjansen4857]

Thanks. Will replace the 2024.2.3 update I just did today after this is merged