Increase default timeout in modal_run_config

[msaroufim]

Increased the default timeout for modal_run_config from 300 to 600 seconds.

Description

Please provide a brief summary of the changes in this pull request.

Checklist

Before submitting this PR, ensure the following steps have been completed:

• Run the slash command /verifyruns on your own server.
  • Run the cluster bot on your server:

    python discord-bot.py

  • Start training runs with the slash command /verifyruns.
  • Verify that the bot eventually responds with:

    ✅ All runs completed successfully!
    

    (It may take a few minutes for all runs to finish. In particular, the GitHub
    runs may take a little longer. The Modal run is typically quick.)
    For more information on running a cluster bot on your own server, see
    README.md.

[Copilot]

Pull Request Overview

This PR increases the default timeout for Modal script execution from 5 minutes to 10 minutes to allow longer-running training operations to complete successfully.

• Doubled the default timeout value from 300 to 600 seconds in the modal_run_config function

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[github-actions]

Coverage report

This PR does not seem to contain any modification to coverable code.