Clipping with log depth and adjusted depth plane

[ggetz]

https://github.com/CesiumGS/cesium/pull/9200 introduced the ability to adjust the depth plane to prevent clipping when data is below the ellipsoid, however, this is not handled in the log depth buffer.

The error can be reproduce din this sandcastle if you tip the camera up slightly.

[v8gx]

Thanks! I will add the image here as well, the area marked red should not be clipped of the character model.

I would also point out that this issue occurs without log depth. So the title could be corrected: Clipping without the log depth and adjusted depth plane

(https://github.com/CesiumGS/cesium/pull/9200 did fix this issue when log depth is on.)