Fix output final text for HuggingFaceTextGenInference when streaming #6211
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The LLM integration HuggingFaceTextGenInference already has streaming support.
However, when streaming is enabled, it always returns an empty string as the final output text when the LLM is finished. This is because
textis instantiated with an empty string and never updated.This PR fixes the collection of the final output text by concatenating new tokens.