Add Free Threaded builds for iOS #159385

Feature or enhancement

The iOS build and test tooling currently only supports GIL-enabled builds. It should be extended to allow for free threaded builds.

It may be beneficial to make those changes in a generic way that allows for other ABI types (like debug builds).

Has this already been discussed elsewhere?

This is a minor feature, which does not need previous discussion elsewhere

Links to previous discussion of this feature:

No response

Linked PRs

• gh-159385: Add support for free-threaded and debug builds for iOS #159386