Test: add a timeout test for downloading chunks from the stream

[danwkennedy]

Description

This test will fail until we merge the changes in this PR. I wanted to take the proposed changes there so I'm adding a test to be merged after the fact.

This should check that a hung stream will fail. I updated the code to make the timeout configurable so we're not waiting the full 30s.

[Copilot]

Pull Request Overview

This PR adds a timeout test for the streamExtractExternal function to verify that hung streams fail appropriately. The test verifies the timeout functionality by creating a mock HTTP response that never completes and ensuring the function throws a timeout error.

• Makes the timeout configurable in streamExtractExternal function by adding an optional opts parameter
• Adds a test case that simulates a hung HTTP stream and verifies timeout behavior with a 2ms timeout

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
packages/artifact/src/internal/download/download-artifact.ts	Adds configurable timeout parameter to streamExtractExternal function
packages/artifact/tests/download-artifact.test.ts	Adds test case and mock for hung stream timeout scenario

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