### 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)
} else {
		import_tabs->set_tab_hidden(import_tabs->get_tab_idx_from_control(ImportDock::get_singleton()), false);
		node_tabs->set_tab_hidden(node_tabs->get_tab_idx_from_control(NodeDock::get_singleton()), false);
		fs_tabs->set_tab_hidden(fs_tabs->get_tab_idx_from_control(FileSystemDock::get_singleton()), false);
		history_tabs->set_tab_hidden(history_tabs->get_tab_idx_from_control(history_dock), false);
		main_editor_buttons[EDITOR_3D]->set_visible(true);
		main_editor_buttons[EDITOR_SCRIPT]->set_visible(true);
		if (AssetLibraryEditorPlugin::is_available()) {
			main_editor_buttons[EDITOR_ASSETLIB]->set_visible(true);
		}
	}
	_update_dock_slots_visibility();
}
void EditorNode::_bind_methods() {
	ClassDB::bind_method(D_METHOD("push_item", "object", "property", "inspector_only"), &EditorNode::push_item, DEFVAL(""), DEFVAL(false));
	ClassDB::bind_method("set_edited_scene", &EditorNode::set_edited_scene);
	ClassDB::bind_method("open_request", &EditorNode::open_request);
	ClassDB::bind_method("edit_foreign_resource", &EditorNode::edit_foreign_resource);
	ClassDB::bind_method("is_resource_read_only", &EditorNode::is_resource_read_only);
	ClassDB::bind_method("stop_child_process", &EditorNode::stop_child_process);
	ClassDB::bind_method("_set_main_scene_state", &EditorNode::_set_main_scene_state);
	ClassDB::bind_method("_update_recent_scenes", &EditorNode::_update_recent_scenes);
	ADD_SIGNAL(MethodInfo("request_help_search"));
	ADD_SIGNAL(MethodInfo("script_add_function_request", PropertyInfo(Variant::OBJECT, "obj"), PropertyInfo(Variant::STRING, "function"), PropertyInfo(Variant::PACKED_STRING_ARRAY, "args")));
	ADD_SIGNAL(MethodInfo("resource_saved", PropertyInfo(Variant::OBJECT, "obj")));
	ADD_SIGNAL(MethodInfo("scene_saved", PropertyInfo(Variant::STRING, "path")));
	ADD_SIGNAL(MethodInfo("scene_changed"));
	ADD_SIGNAL(MethodInfo("scene_closed", PropertyInfo(Variant::STRING, "path")));
}
static Node *_resource_get_edited_scene() {