Make worker compatible with Windows

[gabriele-v]

Make worker compatible with Windows with three changes:

• Replace os.uname()[1] with socket.gethostname()
• Fork only if os.fork is available
• Return the appropriate death penalty class based on platform: Return the appropriate death penalty class based on platform rq/rq#2279

[Copilot]

Pull request overview

This PR aims to make the scheduler worker behave correctly on Windows by avoiding Unix-only APIs and selecting an appropriate timeout (“death penalty”) implementation based on platform capabilities.

Changes:

• Guard job forking so it’s only used when os.fork exists, otherwise run jobs in-process.
• Replace os.uname()[1] with socket.gethostname() for cross-platform worker naming.
• Select the default death-penalty implementation dynamically (SIGALRM-based vs timer-based).

Reviewed changes

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

File	Description
scheduler/worker/worker.py	Avoids Unix-only fork() usage when unavailable; uses socket.gethostname() for worker naming.
scheduler/types/settings_types.py	Switches config default from a hard-coded Unix death penalty class to a platform-derived default.
scheduler/helpers/timeouts.py	Introduces a helper to choose the default death penalty class based on SIGALRM availability.

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