Auto merge of #129797 - workingjubilee:cleanup-apple-ci, r=workingjub…

…ilee

Try to reduce space usage in dist CI

We have had recurrent CI problems as a result of GitHub adding a new version of Xcode to its runners[^0], which has consumed ~40GB of space which served as padding. Try to reduce the number of Xcodes on our systems, because we only use Xcode 14 in actual practice. Also, try to move files instead of pointlessly copy them when we're at the end of the job.

I could not resist addressing a few shellcheck lints while I was at it.

[^0]: actions/runner-images#10511