Fog Sky Affect Not Working in Compatibility Renderer

[Qainguin]

Tested versions

• Reproducible in 4.2.2

System information

Godot v4.2.2.stable - macOS 14.1.1 - GLES3 (Compatibility) - Apple M1 - Apple M1 (8 Threads)

Issue description

The sky affect variable in the WorldEnvironment node does not seem to do anything even when the fog is enabled.

Steps to reproduce

1. Create a new Project
2. Create a WorldEnvironment Node
3. Put any type of sky in the Sky parameter
4. Enable Fog
5. Try to adjust the sky_affect variable.

Minimal reproduction project (MRP)

N/A

[Calinou]

Thanks for the report! Consolidating in #66456.