introspect: Add WindowsChanged signal
The screencast portal supports recording a single window, and presents a list of open windows when that option is selected. To allow updating that list when windows are opened or closed, add a new "WindowsChanged" signal that the portal can listen to. Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2229>
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3e2460b1
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