### 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 (id) {
		agile_input_event_flushing = GLOBAL_DEF("input_devices/buffering/agile_event_flushing", false);
		if (bool(GLOBAL_DEF_BASIC("input_devices/pointing/emulate_touch_from_mouse", false)) &&
				!(editor || project_manager)) {
			if (!DisplayServer::get_singleton()->is_touchscreen_available()) {
				/
				id->set_emulate_touch_from_mouse(true);
			}
		}
		id->set_emulate_mouse_from_touch(bool(GLOBAL_DEF_BASIC("input_devices/pointing/emulate_mouse_from_touch", true)));
	}
	GLOBAL_DEF_BASIC("input_devices/pointing/android/enable_long_press_as_right_click", false);
	GLOBAL_DEF_BASIC("input_devices/pointing/android/enable_pan_and_scale_gestures", false);
	MAIN_PRINT("Main: Load Translations and Remaps");
	translation_server->setup(); 
	if (!locale.is_empty()) {
		translation_server->set_locale(locale);
	}
	translation_server->load_translations();
	ResourceLoader::load_translation_remaps(); 
	ResourceLoader::load_path_remaps();
	MAIN_PRINT("Main: Load TextServer");
	/
	GLOBAL_DEF_RST("internationalization/rendering/text_driver", "");
	String text_driver_options;
	for (int i = 0; i < TextServerManager::get_singleton()->get_interface_count(); i++) {
		const String driver_name = TextServerManager::get_singleton()->get_interface(i)->get_name();
		if (driver_name == "Dummy") {
			/
			continue;