🚀 feat: Add Code API Proxy Support and Update MCP SDK

[danny-avila]

Summary

• Added proxy configuration in axios options for getCodeOutputDownloadStream and uploadCodeEnvFile when process.env.PROXY is defined.
  • Closes [Bug]: Code interpreter not working for upload/download due to proxy issues #6194
• Refactored axios request options, including inline type annotations, to support proxy setups and improved error logging using logAxiosError.
• Bumped the "@modelcontextprotocol/sdk" dependency from ^1.4.1 to ^1.6.1 in package.json.
• Updated build scripts in package.json to use @rollup/plugin-typescript and revised rollup flags.
• Modified rollup.config.js to streamline the build process into an ESM-only output with updated plugin configurations.

Change Type:

• New feature (non-breaking change which adds functionality)

Testing:

• Manually tested file download and upload endpoints with a proxy environment variable set.
• Ran local unit tests (npm test) to ensure all changes work as expected and no warnings are emitted.
• Verified the updated build commands in the MCP package complete successfully.

Checklist:

• My code adheres to this project's style guidelines
• I performed a self-review of my code
• I commented in any complex areas of my code
• I made pertinent documentation changes
• My changes do not introduce new warnings
• I wrote tests demonstrating that my changes are effective
• Local unit tests pass with my changes
• Any changes dependent on mine have been merged and published in downstream modules