Run e2e CI only on macos. (#27165)

* Try testing macos-latest only.

* Simplify puppeteer.js

* Update package.json

* Update package-lock.json

* Ugh...

* Alright...

* That should do it...

* Clean up.

* Avoid duplicated runs (I think).

* Added webgl_loader_texture_ktx to exception list.