Problem
-> see main Issue

Solution
In the RAG Window for a LR:

• Add a preview of the prompt that will be sent just as in the trainings window. The preview will render the propmpt as it would be send to the LLM
• Add Checkboxes in the left column to enable sending the examples with the RAG:
  • Send examples with the system-messages
  • Send examples with source and target
• the result of that can only be evaluated in the preview and a note should hint at that. The examples will not be accessible in the prompt-view to the left. The data-model having these properties for every individual prompt will not change though

Additional TODO
In the trainings-window, the Trainings-data Button produces an exception