Update instructions for AWS credentials in ArXiv download and extract tutorial

[sarahyurick]

No description provided.

[greptile-apps]

Greptile Summary

This PR improves the ArXiv tutorial by moving AWS credentials setup to the top of the notebook, before Ray client initialization. This prevents credentials-related errors that can occur when credentials are set after Ray starts. The changes include:

• Added AWS credentials cell at the beginning of the notebook with clear instructions
• Added helpful note about not using quotes when setting environment variables
• Moved credentials instructions from the ArXiv section to the Prerequisites section
• Replaced shell command (!s5cmd) with subprocess.run() for better error handling and output capture in the S3 bucket accessibility test
• Added # noqa: S602 comment to suppress security warning for necessary shell=True usage

Confidence Score: 5/5

• This PR is safe to merge with minimal risk
• The changes are documentation and tutorial improvements that fix a real user experience issue. The code changes are minimal and well-justified (replacing shell command with subprocess for better error handling). No logical errors or security issues were introduced.
• No files require special attention

Important Files Changed

Filename	Overview
tutorials/text/download-and-extract/download_extract_tutorial.ipynb	Moved AWS credentials setup to top of notebook before Ray initialization, added helpful instructions about credential formatting, and improved S3 bucket accessibility test with better error handling

Sequence Diagram

sequenceDiagram
    participant User
    participant Notebook
    participant AWS
    participant Ray
    participant ArxivPipeline

    User->>Notebook: Set AWS_ACCESS_KEY_ID
    User->>Notebook: Set AWS_SECRET_ACCESS_KEY
    User->>Notebook: Set AWS_SESSION_TOKEN
    Note over Notebook: Credentials must be set BEFORE Ray client
    
    Notebook->>Ray: Initialize RayClient()
    Ray-->>Notebook: Client ready
    
    Notebook->>AWS: Test S3 bucket access (subprocess.run)
    AWS-->>Notebook: Return bucket listing
    
    Notebook->>ArxivPipeline: Create ArxivDownloadExtractStage
    Notebook->>ArxivPipeline: Run pipeline
    ArxivPipeline->>AWS: Download tar files (uses credentials)
    AWS-->>ArxivPipeline: Return data
    ArxivPipeline-->>Notebook: Return extracted results

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