Fix 3d tiles clipping planes sandcastle

[lilleyse]

Error when calling scene.primitives.removeAll with a mix of primitives and entities. Same problem as #6367.

@hpinkos can you review?

[cesium-concierge]

@lilleyse, thanks for the pull request! Maintainers, we have a signed CLA from @lilleyse, so you can review this at any time.

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[hpinkos]

I think you need to replace this with something like viewer.scene.primitives.remove(tileset)

[hpinkos]

Can you make that change to Terrain Clipping Planes.html too?

[hpinkos]

Camera.html also calls scene.primitives.removeAll for removing the DebugModelMatrixPrimitive added in the setReferenceFrame section. Change that to something like scene.primitives.remove(referenceFramePrimitive)

[lilleyse]

@hpinkos Updated