Opacity slider doesn't work for Strata datasets

[AnaBelgun]

The new opacity slider seems to perform well for reality meshes and buildings, but it doesn't work for strata datasets. To investigate ideal behaviour (e.g. should the opacity slider even be available for strata datasets, when they have stratum / story slider?)

Here is a test link: https://nsw.digitaltwin.terria.io/#share=s-nJJga7xG00vSn0gZtiaCm9o0COg

[AnaBelgun]

duplicate of https://github.com/TerriaJS/nsw-digital-twin/issues/574

[nf-s]

I believe this is due to a clash between OpacityTraits and Cesium3dTilesTraits.style