transformers - 💡(How to fix) Fix pipeline text-generation ignores return_full_text=False with chat template

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When using the text-generation pipeline with a chat template format, setting return_full_text=False still returns the full conversation including the prompt. Tested on transformers 4.40.x, model meta-llama/Llama-3-8B-Instruct. Expected: only generated text. Actual: full prompt + generated text.

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transformers - 💡(How to fix) Fix pipeline text-generation ignores return_full_text=False with chat template