[Security] Harden downloadFile to check for non-2xx status codes

[gonzaloriestra]

WHY are these changes introduced?

The downloadFile function previously did not check the response status code, which could result in error pages being saved as files and the promise resolving successfully even on failure.

WHAT is this pull request doing?

Hardens downloadFile in packages/cli-kit/src/public/node/http.ts by validating res.ok before piping the response body. If the response is not successful, it destroys the file stream, removes the partial file, and rejects the promise with an error message containing the status code.

How to test your changes?

CI

Post-release steps

Checklist

• I've considered possible cross-platform impacts (Mac, Linux, Windows)
• I've considered possible documentation changes
• I've considered analytics changes to measure impact
• The change is user-facing — I've identified the correct bump type (patch for bug fixes · minor for new features · major for breaking changes) and added a changeset with pnpm changeset add

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PR created automatically by Jules for task 490676649903503427 started by @gonzaloriestra

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