### 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)
Viewport::SDFOversize sdf_oversize = Viewport::SDFOversize(int(GLOBAL_GET("rendering/2d/sdf/oversize")));
	scene_root->set_sdf_oversize(sdf_oversize);
	Viewport::SDFScale sdf_scale = Viewport::SDFScale(int(GLOBAL_GET("rendering/2d/sdf/scale")));
	scene_root->set_sdf_scale(sdf_scale);
	Viewport::MSAA msaa = Viewport::MSAA(int(GLOBAL_GET("rendering/anti_aliasing/quality/msaa_2d")));
	scene_root->set_msaa_2d(msaa);
	bool use_hdr_2d = GLOBAL_GET("rendering/viewport/hdr_2d");
	scene_root->set_use_hdr_2d(use_hdr_2d);
	float mesh_lod_threshold = GLOBAL_GET("rendering/mesh_lod/lod_change/threshold_pixels");
	scene_root->set_mesh_lod_threshold(mesh_lod_threshold);
	RS::get_singleton()->decals_set_filter(RS::DecalFilter(int(GLOBAL_GET("rendering/textures/decals/filter"))));
	RS::get_singleton()->light_projectors_set_filter(RS::LightProjectorFilter(int(GLOBAL_GET("rendering/textures/light_projectors/filter"))));
	SceneTree *tree = get_tree();
	tree->set_debug_collisions_color(GLOBAL_GET("debug/shapes/collision/shape_color"));
	tree->set_debug_collision_contact_color(GLOBAL_GET("debug/shapes/collision/contact_color"));
	ResourceImporterTexture::get_singleton()->update_imports();
#ifdef DEBUG_ENABLED
	NavigationServer3D::get_singleton()->set_debug_navigation_edge_connection_color(GLOBAL_GET("debug/shapes/navigation/edge_connection_color"));
	NavigationServer3D::get_singleton()->set_debug_navigation_geometry_edge_color(GLOBAL_GET("debug/shapes/navigation/geometry_edge_color"));
	NavigationServer3D::get_singleton()->set_debug_navigation_geometry_face_color(GLOBAL_GET("debug/shapes/navigation/geometry_face_color"));
	NavigationServer3D::get_singleton()->set_debug_navigation_geometry_edge_disabled_color(GLOBAL_GET("debug/shapes/navigation/geometry_edge_disabled_color"));
	NavigationServer3D::get_singleton()->set_debug_navigation_geometry_face_disabled_color(GLOBAL_GET("debug/shapes/navigation/geometry_face_disabled_color"));
	NavigationServer3D::get_singleton()->set_debug_navigation_enable_edge_connections(GLOBAL_GET("debug/shapes/navigation/enable_edge_connections"));
	NavigationServer3D::get_singleton()->set_debug_navigation_enable_edge_connections_xray(GLOBAL_GET("debug/shapes/navigation/enable_edge_connections_xray"));
	NavigationServer3D::get_singleton()->set_debug_navigation_enable_edge_lines(GLOBAL_GET("debug/shapes/navigation/enable_edge_lines"));
	NavigationServer3D::get_singleton()->set_debug_navigation_enable_edge_lines_xray(GLOBAL_GET("debug/shapes/navigation/enable_edge_lines_xray"));
	NavigationServer3D::get_singleton()->set_debug_navigation_enable_geometry_face_random_color(GLOBAL_GET("debug/shapes/navigation/enable_geometry_face_random_color"));
#endif 
}
void EditorNode::_gdextensions_reloaded() {