Fix a bunch of weird entity show problems

[hpinkos]

Fixes #2909
Fixes #4714
Fixes #6830

We were copying the stored attribute value from the previous geometry to the new geometry instead of updating the stored attributes values to match the new geometry ones. 🤦‍♀️

[cesium-concierge]

Thanks for the pull request @hpinkos!

• ✔️ 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.

Reviewers, don't forget to make sure that:

• Cesium Viewer works.
• Works in 2D/CV.
• Works (or fails gracefully) in IE11.

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[mramato]

The real story here is that I somehow was unaware of the facepalm emojis. So thanks for the bugfix and emoji lesson.

I'll take a look at this later today.

[mramato]

I can't believe this code survived this long unnoticed (one of those bugs is over 3 years old!). Thanks for catching this @hpinkos I'm sure there is a lot of oddness people have ran into that is now fixed. Thanks @lilleyse for such an easy to reproduce test case.