Citations made visible in the output for Perplexity Sonar research models

[ferenci84]

Description

Perplexity Sonar Pro can be set up via OpenAI provider, but it's citations cannot be visible.

This modification adds the citations into the LLM log.

Checklist

• The relevant docs, if any, have been updated or created
• The relevant tests, if any, have been updated or created

Screenshots

[ For visual changes, include screenshots. ]

Testing instructions

Config to Perplexity Sonar Pro:

{
      "title": "Perplexity Sonar Pro",
      "provider": "openai",
      "apiKey": "",
      "apiBase": "https://api.perplexity.ai",
      "model": "sonar-pro"
    },

Citations will be visible in the LLM output tab.

Issue for more context: #4512

This is a partial solution of the issue not including UI changes.

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