### 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)
{
		String driver_hints = "";
		String driver_hints_angle = "";
		String driver_hints_egl = "";
#ifdef GLES3_ENABLED
		driver_hints = "opengl3";
		driver_hints_angle = "opengl3,opengl3_angle"; 
		driver_hints_egl = "opengl3,opengl3_es"; 
#endif
		String default_driver = driver_hints.get_slice(",", 0);
		String default_driver_macos = driver_hints_angle.get_slice(",", 1);
		GLOBAL_DEF_RST_NOVAL("rendering/gl_compatibility/driver", default_driver);
		GLOBAL_DEF_RST_NOVAL(PropertyInfo(Variant::STRING, "rendering/gl_compatibility/driver.windows", PROPERTY_HINT_ENUM, driver_hints_angle), default_driver);
		GLOBAL_DEF_RST_NOVAL(PropertyInfo(Variant::STRING, "rendering/gl_compatibility/driver.linuxbsd", PROPERTY_HINT_ENUM, driver_hints_egl), default_driver);
		GLOBAL_DEF_RST_NOVAL(PropertyInfo(Variant::STRING, "rendering/gl_compatibility/driver.web", PROPERTY_HINT_ENUM, driver_hints), default_driver);
		GLOBAL_DEF_RST_NOVAL(PropertyInfo(Variant::STRING, "rendering/gl_compatibility/driver.android", PROPERTY_HINT_ENUM, driver_hints), default_driver);
		GLOBAL_DEF_RST_NOVAL(PropertyInfo(Variant::STRING, "rendering/gl_compatibility/driver.ios", PROPERTY_HINT_ENUM, driver_hints), default_driver);
		GLOBAL_DEF_RST_NOVAL(PropertyInfo(Variant::STRING, "rendering/gl_compatibility/driver.macos", PROPERTY_HINT_ENUM, driver_hints_angle), default_driver_macos);
		GLOBAL_DEF_RST("rendering/gl_compatibility/nvidia_disable_threaded_optimization", true);
		GLOBAL_DEF_RST("rendering/gl_compatibility/fallback_to_angle", true);
		GLOBAL_DEF_RST("rendering/gl_compatibility/fallback_to_native", true);
		GLOBAL_DEF_RST("rendering/gl_compatibility/fallback_to_gles", true);
		Array device_blocklist;
#define BLOCK_DEVICE(m_vendor, m_name)      \
	{                                       \
		Dictionary device;                  \
		device["vendor"] = m_vendor;        \
		device["name"] = m_name;            \
		device_blocklist.push_back(device); \
	}