Fix: WidgetMessaging not properly closed causing side effects and bugs

[BillCarsonFr]

Partial fix #31573

The widgetApi were not properly closed, causing them to leak forever and stil trying to handle requests sent to the WidgetAPI.
Video room widgets are heavily impacted because they keep the same widgetID, so one call to the widgetAPI will be handled by all the leaking objects.

There is playwright test to reproduce 9d56dd9

One call to send message with the widget API can send 3 times the message

Checklist

• I have read through review guidelines and CONTRIBUTING.md.
• Tests written for new code (and old code if feasible).
• New or updated public/exported symbols have accurate TSDoc documentation.
• Linter and other CI checks pass.
• I have licensed the changes to Element by completing the Contributor License Agreement (CLA)

[toger5]

Thanks for also adding the comment on the remove all listeners.