Add env example file and workflow group for ai pr generation

[nwthomas]

Problem

• Lack of concurrency control in the GitHub Actions workflow for generating pull request descriptions.
• Missing example environment file for AI-related configurations.

Solution

• Added concurrency settings to the GitHub Actions workflow to prevent overlapping runs and ensure only one instance is active at a time.
• Changed the Python version in the workflow from 3.12 to 3.11 for compatibility purposes.
• Introduced a new .env.example file to provide placeholders for OPENAI_API_KEY and PINECONE_API_KEY, aiding developers in setting up their local environments.

Testing

• Not specified in the pull request, but typical testing would involve running the updated workflow to ensure concurrency control works as expected and verifying that the environment variables can be loaded correctly from the example file.

Reverting

• To revert these changes, remove the concurrency settings from the workflow, revert the Python version to 3.12, and delete the .env.example file.

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