fix: properly build xcframework

[okwasniewski]

Hey,

This PR features multiple changes to fix how xcframeworks are handled.

Changes included:

• Move from macos-latest-large to macos-latest for the CI (Only build-dawn.yml requires M1 machine for now)
• Remove visionOS x86 build (building on Intel macs for visionOS is deprecated so lets not waste resources on this)
• I aligned apple.toolchain.cmake with upstream source code.
• Package only xcframeworks in build dawn job (currently the artifacts were over 450mbs because contained unnecessary stuff)

Changes to build scripts

So before we created a bunch of xcframeworks then linked them for each platform.

The whole idea behind xcframeworks is to have one bundle for multiple platforms(!).

Before (contents generated by build-dawn job):

Now:

[okwasniewski]

cc: @Saadnajmi @wcandillon

[wcandillon]

Looks great thank you :) :)

[okwasniewski]

Im not sure why this fails.. Probably we need to re-trigger build-dawn?

[okwasniewski]

@wcandillon The build is green! I missed that I removed additional line from podspec (which is now back)!

[wcandillon]

thanks for pushing the fixes :)