GLTF export: Propagate property_list_changed
from extensions
#90225
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Before this PR, GLTFDocumentExtension
property_list_changed
signals were being ignored. With this PR, the signal is passed to the exporter settings object, which causes it to regenerate the property list and then bounce the changed signal. This allows GLTFDocumentExtension classes to selectively hide or show properties in the inspector UI, like is already possible with inspecting most things in Godot.