Fixed rendering issues related to environmentState.renderTranslucentDepthForPick

[lilleyse]

This PR has the changes in #9844 plus some of my own changes. Opening as a separate PR because the original branch was not recoverable.

@ebogo1 this should be good, but could you do a final review and merge?

[cesium-concierge]

Thanks for the pull request @lilleyse!

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Reviewers, don't forget to make sure that:

• Cesium Viewer works.
• Works in 2D/CV.

[ebogo1]

Thanks @lilleyse - these changes look good to me. I noticed a couple things:

1. After rotating the camera, picked positions outside of the point cloud are undefined. After speaking offline, it's possible this is related to pickPosition isn't accurate when depthTestAgainstTerrain is false #8179
2. The original PR mentioned issues with viewer.camera.switchToPerspectiveFrustum() and viewer.camera.switchToOrthographicFrustum() after these changes. I used the Sandcastle code from #9824 to double check this, and I was unable to reproduce any problems.