Disable PointerEvents in Firefox until they work.

[mramato]

We previously only disabled them in tests for #6539, but #6372 indicates the problem may be more widespread.

[cesium-concierge]

Thanks for the pull request @mramato!

• ✔️ 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]

CC @ggetz If the users encountering this issue in #6372 get back to us in time, we should definitely merge this for the release.

If we don't hear back by release time, we can punt to next month.

[ggetz]

Thanks @mramato. Can you also update CHANGES.md? Then this should be good to go.

[mramato]

Ready

[ggetz]

Thanks again!