### 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)
int split = res_remaps[i].rfind(":");
			if (split == -1) {
				continue;
			}
			String l = res_remaps[i].substr(split + 1).strip_edges();
			int score = TranslationServer::get_singleton()->compare_locales(locale, l);
			if (score > 0 && score >= best_score) {
				new_path = res_remaps[i].left(split);
				best_score = score;
				if (score == 10) {
					break; 
				}
			}
		}
		if (r_translation_remapped) {
			*r_translation_remapped = true;
		}
		
		if (!FileAccess::exists(new_path + ".import") && !FileAccess::exists(new_path)) {
			WARN_PRINT(vformat("Translation remap '%s' does not exist. Falling back to '%s'.", new_path, p_path));
			new_path = p_path;
		}
	}
	if (path_remaps.has(new_path)) {
		new_path = path_remaps[new_path];
	} else {
		
		Error err;
		Ref<FileAccess> f = FileAccess::open(new_path + ".remap", FileAccess::READ, &err);
		if (f.is_valid()) {