View Frame Time FPS counter (and Viewport GPU render time) is not working on macOS on Intel IGP or when using Metal

### Godot version

4.0.master

### System information

MacOS

### Issue description

Using the latest MoltenVK I'm not getting an FPS counter which works in master/4.0

I haven't ever seen it working.

### Steps to reproduce

1. Open master on Mac
2. Open viewport info
3. FPS counter will show the wrong values.


### Minimal reproduction project

_No response_