haystack/components/generators/hugging_face_local.py "stop_words" not behaving as expected

[sephcodes]

Describe the bug
according to the documentation: "param stop_words: If the model generates a stop word, the generation stops."
however, stop_words is just being used to remove whatever is defined as a stopword from the final output. It is not stopping generation when a stop word is encountered.
If possible, a way to stop generation using stop words would be useful

Error message
N/A

Expected behavior
Expecting the stop_words argument to stop generation of output when a value in stop_words list is encountered

Additional context
N/A

To Reproduce
generator = self.generator(model="HuggingFaceTB/SmolLM-1.7B-Instruct",
task="text-generation",
stop_words=self.stop_words,
generation_kwargs={
"max_new_tokens": 150,
# "do_sample": False,
"do_sample": True,
"temperature": 0.5,
# "top_p": 0.9,
# "eos_token_id": self.tokenizer.eos_token_id,
# "stopping_criteria": self.stopping_criteria
})
whatever is defined in self.stop_words will just be dropped from the output but not stop generation of text as expected

FAQ Check
N/A

System:
All