Editor: Undo for shader graph node doesn't work

## Description

Undo for shader graph node doesn't work

## Steps to Reproduce

1. Open Material Editor
2. Create any node an attach to the root
3. Delete this node
4. Undo the operation

### Expected behavior:

4. The node it's link returned back

### Actual behavior:

4. Nothing happened

### Reproducibility:

100%

## Versions

2025.4
