### 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)
case RenderingDevice::DeviceType::DEVICE_TYPE_VIRTUAL_GPU:
			device_type_string = "virtual";
			break;
		case RenderingDevice::DeviceType::DEVICE_TYPE_CPU:
			device_type_string = "(software emulation on CPU)";
			break;
		case RenderingDevice::DeviceType::DEVICE_TYPE_OTHER:
		case RenderingDevice::DeviceType::DEVICE_TYPE_MAX:
			break; 
	}
	const Vector<String> video_adapter_driver_info = OS::get_singleton()->get_video_adapter_driver_info();
	const String processor_name = OS::get_singleton()->get_processor_name();
	const int processor_count = OS::get_singleton()->get_processor_count();
	
	if (rendering_method == "forward_plus") {
		rendering_method = "Forward+";
	} else if (rendering_method == "mobile") {
		rendering_method = "Mobile";
	} else if (rendering_method == "gl_compatibility") {
		rendering_method = "Compatibility";
		driver_name = GLOBAL_GET("rendering/gl_compatibility/driver");
	}
	if (driver_name == "vulkan") {
		driver_name = "Vulkan";
	} else if (driver_name.begins_with("opengl3")) {
		driver_name = "GLES3";
	}
	
	Vector<String> info;
	info.push_back(godot_version);