fix: issue with module workers

[Bayheck]

Purpose

Describe the problem you want to address or the feature you want to implement.

Approach

Describe how your changes address the issue or implement the desired functionality in as much detail as possible.

References

Test in TestCafe: DevExpress/testcafe#8413
Closes DevExpress/testcafe#8251

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 attempts to fix an issue with module workers by detecting whether a worker is a module worker and using import() instead of importScripts() to load the hammerhead library.

• Adds an isModule() detection function that attempts to call importScripts() to determine if the worker context is a module worker
• Conditionally uses import() for module workers and importScripts() for classic workers
• Updates the worker initialization code in the script header template

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