### 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)
}
		}
		te->set_caret_line(row);
		te->set_caret_column(col);
		te->insert_text_at_caret(text_to_drop);
		te->grab_focus();
	}
	if (d.has("type") && String(d["type"]) == "obj_property") {
		te->remove_secondary_carets();
		
		
		const String text_to_drop = _quote_drop_data(String(d["property"]));
		te->set_caret_line(row);
		te->set_caret_column(col);
		te->insert_text_at_caret(text_to_drop);
		te->grab_focus();
	}
}
void ScriptTextEditor::_text_edit_gui_input(const Ref<InputEvent> &ev) {
	Ref<InputEventMouseButton> mb = ev;
	Ref<InputEventKey> k = ev;
	Point2 local_pos;
	bool create_menu = false;
	CodeEdit *tx = code_editor->get_text_editor();
	if (mb.is_valid() && mb->get_button_index() == MouseButton::RIGHT && mb->is_pressed()) {
		local_pos = mb->get_global_position() - tx->get_global_position();
		create_menu = true;
	} else if (k.is_valid() && k->is_action("ui_menu", true)) {
		tx->adjust_viewport_to_caret(0);
		local_pos = tx->get_caret_draw_pos(0);