Auto merge of #25426 - kunalmohan:25149-EventOrigin, r=jdm

Remove `origin` parameter from `Worker::handle_message`

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Test in  `workers/interfaces/DedicatedWorkerGlobalScope/postMessage/message-event.html` was failing because worker.onmessage was seeing non-empty event.origin. Removing `origin` parameter from `Worker::handle_message` and sending `None` to `MessageEvent::dispatch_jsval` solves the issue.

r?@jdm

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- [X] These changes fix #25149  (GitHub issue number if applicable)

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