VisualShader.get_property_list() returns the deprecated graph_offset property.

### Tested versions

v4.7.1.stable.arch_linux [a13da4feb]

### System information

Godot v4.7.1.stable (a13da4feb) - CachyOS Linux #1 SMP PREEMPT_DYNAMIC Sun, 26 Jul 2026 08:59:50 +0000 on Wayland - X11 display driver, Multi-window, 2 monitors - Vulkan (Forward+) - dedicated NVIDIA GeForce RTX 4070 SUPER (nvidia; 610.43.03) - AMD Ryzen 7 7800X3D 8-Core Processor (16 threads) - 30.45 GiB memory - PulseAudio (44100 Hz, Stereo/mono)

### Issue description

VisualShader.get_property_list() returns the deprecated graph_offset property. Iterating over the returned properties and calling Object.get(property.name) emits the warning:

graph_offset property is deprecated. Getting it always returns Vector2().

This makes generic property inspection impossible without special-casing graph_offset.

### Steps to reproduce

Run the provided script in the editor.

### Minimal reproduction project (MRP)

```
@tool
extends EditorScript

func _run():
var shader := VisualShader.new()

for property in shader.get_property_list():
shader.get(property.name)
```

Run the provided @tool EditorScript reproduction in the editor, then inspect the VisualShader.get_property_list() entry point and how it exposes graph_offset. Done means the deprecated graph_offset property is no longer returned, and iterating over the returned properties with Object.get(property.name) no longer emits the warning.

Written by the indexing model from the issue text.