Custom Attribute rename error and warning are logged twice when renaming a Blackboard Custom Attribute to an invalid or duplicate name in the VFX Graph

Steps to reproduce:

1. Create a URP 3D project with the Visual Effect Graph package installed
2. Create a Visual Effect Graph asset and open it
3. Open the Blackboard and add two Custom Attributes (e.g. "AttribA" and "AttribB")
4. Rename one of the Attributes to the same Label as the other one and observe the Console
5. Rename one of the Attributes so it starts with a number and observe the Console

Actual results: Attribute Errors are logged twice{}

Expected results: Attribute Errors are logged once

Reproducible with versions: 6000.6.0a7
Not reproducible with versions: 6000.0.77f1, 6000.3.16f1, 6000.4.12f1, 6000.5.0f1, 6000.6.0a6
Tested on (OS): Windows 11