Update ion tilesets to 3D Tiles 1.0

[lilleyse]

For #6697
Fixes #5504
Fixes #6832

Not complete yet, but opening now to show that it's in progress.

To do:

• St. Helens
• Chappes
• AGI HQ
• Update NYC tileset
  • Figure out glTF Validator error (skipped for now)
• San Miguel - @likangning93 has a glTF 2.0 version, but we need to fix shininess problems
• Power Plant - we can't upgrade this one yet. It requires KHR_techniques_webgl and this PR: Update gltf Pipeline and support KHR_techniques_webgl and KHR_blend #6805. But we'll be able to update right after that is merged.
• AGI HQ is now positioned on Cesium terrain
  • 3D Tiles Photogrammetry Classification - need to update classification tileset to align with AGI HQ. Edit transform. The classification tileset can probably live in SampleData instead of ion now.
  • Classification - need to move classification geometries to align with AGI HQ
• Point Cloud Classification - the geometry tileset needs content.url to content.uri update. Small enough to live in SampleData now.
• 3D Tiles Terrain Classification - the vector tileset needs content.url to content.uri update

[cesium-concierge]

Thanks for the pull request @lilleyse!

• ✔️ Signed CLA found.
• ❔ CHANGES.md was not updated.
  • If this change updates the public API in any way, please add a bullet point to CHANGES.md.

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[lilleyse]

@ggetz could you take a look at the AGI HQ, Point Cloud Classification, and 3D Tiles Terrain Classification ones?

The upgrade command in 3d-tiles-tools (2.0-tools branch) should be working properly now, though manually editing the tileset.json for some of these may be quicker.

[ggetz]

@lilleyse Updated all the Classification examples.

[lilleyse]

Made some small edits to the new tilesets in ad21f1f.

Someone besides @ggetz and me should test and merge. @tfili, since you are doing the release?

[tfili]

Thanks @lilleyse