### 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)
ScriptServer::get_language(i)->add_global_constant(info.name, n);
						}
					}
				}
				for (Node *E : to_add) {
					sml->get_root()->add_child(E);
				}
				OS::get_singleton()->benchmark_end_measure("load_autoloads");
			}
		}
#ifdef TOOLS_ENABLED
#ifdef MODULE_GDSCRIPT_ENABLED
		if (!doc_tool_path.is_empty() && !gdscript_docs_path.is_empty()) {
			DocTools docs;
			Error err;
			Vector<String> paths = get_files_with_extension(gdscript_docs_path, "gd");
			ERR_FAIL_COND_V_MSG(paths.size() == 0, false, "Couldn't find any GDScript files under the given directory: " + gdscript_docs_path);
			for (const String &path : paths) {
				Ref<GDScript> gdscript = ResourceLoader::load(path);
				for (const DocData::ClassDoc &class_doc : gdscript->get_documentation()) {
					docs.add_doc(class_doc);
				}
			}
			if (doc_tool_path == ".") {
				doc_tool_path = "./docs";
			}
			Ref<DirAccess> da = DirAccess::create_for_path(doc_tool_path);
			err = da->make_dir_recursive(doc_tool_path);
			ERR_FAIL_COND_V_MSG(err != OK, false, "Error: Can't create GDScript docs directory: " + doc_tool_path + ": " + itos(err));
			HashMap<String, String> doc_data_classes;