Temporarily disable OIT by default for iOS and iPad

[ggetz]

Due to increased reports of #9827, this disables orderIndependentTranslucency by default on iOS and iPad as a temporary workaround.

[cesium-concierge]

Thanks for the pull request @ggetz!

• ✔️ Signed CLA found.

Reviewers, don't forget to make sure that:

• Cesium Viewer works.
• Works in 2D/CV.

[ebogo1]

Changes look good. I assume navigator.platform works as expected but I don't have any iOS devices to test on. Have we checked that this branch fixes issues on the newer devices?

[ggetz]

Thanks @ebogo1.

Have we checked that this branch fixes issues on the newer devices?

Do you mean other than the issues which were brought up in #9827?

[ebogo1]

I meant more to check that navigator.platform was identifying iOS devices as the iPad iPhone iPod strings. I couldn't find an official list of its possible values. Happy to merge if we're confident that those are correct, I just wanted to double check.

[ggetz]

I was able to verify this is working on my iPhone, logging the value of Scene.orderIndependentTranslucency:

I tried my iPad, which is a iPad Pro. Unfortunately I believe this type of iPad always presents the desktop version of a website, so the value of navigator.platform is MacIntel, same as my desktop. However, I believe it should work for smaller and older models of iPad.

[ebogo1]

Cool, thanks @ggetz!