### 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 (p_line.get_type() == Variant::INT) {
		goto_line_centered(p_line.operator int64_t());
	} else if (p_line.get_type() == Variant::DICTIONARY) {
		Dictionary meta = p_line.operator Dictionary();
		const int line = meta["line"].operator int64_t() - 1;
		const String code = meta["code"].operator String();
		const String quote_style = EDITOR_GET("text_editor/completion/use_single_quotes") ? "'" : "\"";
		CodeEdit *text_editor = code_editor->get_text_editor();
		String prev_line = line > 0 ? text_editor->get_line(line - 1) : "";
		if (prev_line.contains("@warning_ignore")) {
			const int closing_bracket_idx = prev_line.find(")");
			const String text_to_insert = ", " + code.quote(quote_style);
			prev_line = prev_line.insert(closing_bracket_idx, text_to_insert);
			text_editor->set_line(line - 1, prev_line);
		} else {
			const int indent = text_editor->get_indent_level(line) / text_editor->get_indent_size();
			String annotation_indent;
			if (!text_editor->is_indent_using_spaces()) {
				annotation_indent = String("\t").repeat(indent);
			} else {
				annotation_indent = String(" ").repeat(text_editor->get_indent_size() * indent);
			}
			text_editor->insert_line_at(line, annotation_indent + "@warning_ignore(" + code.quote(quote_style) + ")");
		}
		_validate_script();
	}
}
void ScriptTextEditor::_error_clicked(Variant p_line) {