update Openai API call method

[Strive-for-excellence]

What does this PR do?

Fixes #27623

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Who can review?

@ArthurZucker

[Strive-for-excellence]

This is also same problem in the AzureOpenAiAgent.

class AzureOpenAiAgent(Agent):
.....
    def _chat_generate(self, prompt, stop):
        result = openai.ChatCompletion.create(
            engine=self.deployment_id,
            messages=[{"role": "user", "content": prompt}],
            temperature=0,
            stop=stop,
        )
        return result["choices"][0]["message"]["content"]

However, since I don't have access to the AzureOpenAi API, I'm unable to test this code. Can someone do this job?

[LysandreJik]

Thanks a lot!