Use polylines on terrain for CZML, KML, and GeoJson

[likangning93]

Fixes #6700

[cesium-concierge]

@likangning93, thanks for the pull request! Maintainers, we have a signed CLA from @likangning93, so you can review this at any time.

⚠️ I noticed that CHANGES.md has not been updated. If this change updates the public API in any way, fixes a bug, or makes any non-trivial update, please add a bullet point to CHANGES.md and comment on this pull request so we know it was updated. For more info, see the Pull Request Guidelines.

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[hpinkos]

@likangning93 I'm seeing 1 failing test:
DataSources/KmlDataSource when a LineString is clamped to ground and tesselated with z draworder, entity has a polyline geometry and ColorProperty

[likangning93]

@hpinkos fixed, missed something while fixing an eslint error... whoops.

[mramato]

1. This is a breaking change, please add a separate item to CHANGES.md that specifically mentions that KML and GeoJSON now use PolylineGraphics instead of CorridorGraphics when clampToGround is true.

2. Also add a separate CHANGES item stating the new CZML properties

[likangning93]

@mramato @hpinkos updated!

[hpinkos]

Looks great @likangning93