### 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)
#include "editor/plugins/debugger_editor_plugin.h"
#include "editor/plugins/dedicated_server_export_plugin.h"
#include "editor/plugins/editor_preview_plugins.h"
#include "editor/plugins/editor_resource_conversion_plugin.h"
#include "editor/plugins/gdextension_export_plugin.h"
#include "editor/plugins/material_editor_plugin.h"
#include "editor/plugins/mesh_library_editor_plugin.h"
#include "editor/plugins/node_3d_editor_plugin.h"
#include "editor/plugins/packed_scene_translation_parser_plugin.h"
#include "editor/plugins/root_motion_editor_plugin.h"
#include "editor/plugins/script_text_editor.h"
#include "editor/plugins/text_editor.h"
#include "editor/plugins/version_control_editor_plugin.h"
#include "editor/plugins/visual_shader_editor_plugin.h"
#include "editor/progress_dialog.h"
#include "editor/project_settings_editor.h"
#include "editor/register_exporters.h"
#include "editor/scene_tree_dock.h"
#include "editor/surface_upgrade_tool.h"
#include "editor/window_wrapper.h"
#include <stdio.h>
#include <stdlib.h>
EditorNode *EditorNode::singleton = nullptr;
static const String META_TEXT_TO_COPY = "text_to_copy";
static const String EDITOR_NODE_CONFIG_SECTION = "EditorNode";
void EditorNode::disambiguate_filenames(const Vector<String> p_full_paths, Vector<String> &r_filenames) {
	ERR_FAIL_COND_MSG(p_full_paths.size() != r_filenames.size(), vformat("disambiguate_filenames requires two string vectors of same length (%d != %d).", p_full_paths.size(), r_filenames.size()));
	
	
	Vector<RBSet<int>> index_sets;