testing: testcafe-hammerhead build testing

[Bayheck]

Purpose

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Approach

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References

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Pre-Merge TODO

• Write tests for your proposed changes
• Make sure that existing tests do not fail

[github-actions]

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[Copilot]

Pull request overview

This PR adds test coverage for a hammerhead issue (gh-3046) related to Web Workers with module type, and temporarily updates the testcafe-hammerhead dependency to a custom build hosted on GitHub for testing purposes.

Key Changes:

• Adds functional test suite for Web Worker module type handling with importScripts
• Updates testcafe-hammerhead dependency from npm registry version to a GitHub-hosted custom build
• Includes HTML page, worker script, and TestCafe test fixtures to validate the fix

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
test/functional/fixtures/hammerhead/gh-3046/testcafe-fixtures/index.js	TestCafe fixture testing Web Worker module behavior with debug statements
test/functional/fixtures/hammerhead/gh-3046/test.js	Test runner configuration for the worker module test
test/functional/fixtures/hammerhead/gh-3046/pages/worker.js	Simple worker script that responds to messages
test/functional/fixtures/hammerhead/gh-3046/pages/index.html	HTML page demonstrating Web Worker with module type
package.json	Updates testcafe-hammerhead dependency to custom GitHub URL
package-lock.json	Reflects dependency changes and peer dependency updates

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