Clouds render behind foggy terrain

A side effect of making clouds render farther than terrain in 1.21.6

For easy reproduction:

• Set cloud distance to a large value

• Create an amplified world

• Look off to the distance

Observed results:

• Some terrain which is completely the colour of the sky cuts through the clouds (see screenshot)

Expected results:

• Any vertices that are fully foggy would show clouds

Possible fix:

When calculating fog colour on blocks and entities in the fragment pass, send in the equivalent cloud fragment and overlay it on top.