Disable proxy for internal pull requests

[Pwuts]

Background

• CI fails to make API calls via the proxy, gets 400 Bad Request: https://github.com/Significant-Gravitas/Auto-GPT/actions/runs/5533011279/jobs/10096906731
• Taking the proxy out of the equation lets CI pass: https://github.com/Significant-Gravitas/Auto-GPT/actions/runs/5532961197/jobs/10095778254?pr=4799#logs

Changes

Pass OPENAI_API_TOKEN instead of using PROXY on internal PRs (so from a branch in the repo to another branch in the repo).

Documentation

x

Test Plan

CI

PR Quality Checklist

• My pull request is atomic and focuses on a single change.
• I have thoroughly tested my changes with multiple different prompts.
• I have considered potential risks and mitigations for my changes.
• I have documented my changes clearly and comprehensively.
• I have not snuck in any "extra" small tweaks changes.

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