Converting materials through the Edit menu is not possible anymore

Steps to reproduce:

1. Download attached project and open in Unity.
2. Go to Edit >> Rendering.
3. Observe: Not possible to convert URP materials anymore.

Actual results: Not possible to convert URP materials anymore through the Edit >> Rendering menu.

Expected results: in 6.3, we should allow users to convert the materials through this menu, because the Render Pipeline Converter is not updated in this version yet.

Reproducible with versions: 

6000.3.9f1

Not reproducible with versions: 

In 6.4 and above, the Render Pipeline Converter is updated.

Tested on (OS): 

MacBook Pro (16-inch, 2021), CPU: Apple M1 Max, Memory: 64 GB, macOS Tahoe: 26.1