### Godot version

4.1.3

### System information

Linux

### Issue description

I'm trying to make an editor plugin on Rust:

```rust
#[derive(GodotClass)]
#[class(tool, editor_plugin, init, base=EditorPlugin)]
pub struct MyEditorPluginBase {}
```

But due to some limitations, I still have to use GDScript for some specific things.

So I tried to make a subclass of this Rust class:

```gdscript
@tool
class_name MyEditorPlugin
extends MyEditorPluginBase
```

This would work if `MyEditorPluginBase` was a GDScript class, but since it's a GDExtension class in my case, it doesn't work:

> Unable to load addon script from path: 'res://addons/my_addon/my_editor_plugin.gd' Base type is not EditorPlugin.

But it obviously **IS** EditorPlugin!

![godot-editorplugin-docs](https://github.com/godotengine/godot/assets/3236464/4665deeb-30f0-45cd-bfff-56101b9d4875)

![godot-editorplugin](https://github.com/godotengine/godot/assets/3236464/b1b6ecb4-de22-4abd-91a3-e180691f67ee)

If I understand correctly, this behavior is caused by this function, which checks some mysterious "instance base type" instead of real inheritance:

https://github.com/godotengine/godot/blob/fa4a65387ea41506ecc519fc61a06da110dce51c/editor/editor_node.cpp#L3456-L3458

https://github.com/godotengine/godot/blob/fa4a65387ea41506ecc519fc61a06da110dce51c/modules/gdscript/gdscript.cpp#L260-L263

Since the [documentation](https://docs.godotengine.org/en/stable/tutorials/plugins/editor/making_plugins.html#the-script-file) doesn't say that the script must be a **direct** subclass of EditorPlugin (and an indirect subclass works fine in GDScript), I interpret this behavior as a Godot bug.

### Steps to reproduce

See above

### Minimal reproduction project

[gdext_editor_plugin_test.zip](https://github.com/godotengine/godot/files/13451014/gdext_editor_plugin_test.zip)
}
	if (get_edited_scene()) {
		if (current_tab < 2) {
			Node *editor_node = SceneTreeDock::get_singleton()->get_tree_editor()->get_selected();
			editor_node = editor_node == nullptr ? get_edited_scene() : editor_node;
			if (Object::cast_to<CanvasItem>(editor_node)) {
				editor_select(EDITOR_2D);
			} else if (Object::cast_to<Node3D>(editor_node)) {
				editor_select(EDITOR_3D);
			}
		}
	}
	if (p_state.has("scene_tree_offset")) {
		SceneTreeDock::get_singleton()->get_tree_editor()->get_scene_tree()->get_vscroll_bar()->set_value(p_state["scene_tree_offset"]);
	}
	if (p_state.has("property_edit_offset")) {
		InspectorDock::get_inspector_singleton()->set_scroll_offset(p_state["property_edit_offset"]);
	}
	if (p_state.has("node_filter")) {
		SceneTreeDock::get_singleton()->set_filter(p_state["node_filter"]);
	}
	
	EditorDebuggerNode::get_singleton()->update_live_edit_root();
	ScriptEditor::get_singleton()->set_scene_root_script(editor_data.get_scene_root_script(editor_data.get_edited_scene()));
	editor_data.notify_edited_scene_changed();
	emit_signal(SNAME("scene_changed"));
	
	RenderingServer::get_singleton()->sdfgi_reset();
}
bool EditorNode::is_changing_scene() const {