Add support for macOS 14 and 15

[delan]

this should help with #47.

[delan]

as of kholia/OSX-KVM@ac01120, using the same xml as macos13, macOS 14 gets stuck in a hang and boot loop after the first three stages of installation:

[delan]

as of kholia/OSX-KVM@ac01120, using the same xml as macos13, macOS 14 gets stuck in a hang and boot loop after the first three stages of installation:

per the OSX-KVM docs, we needed to change the CPU from Penryn to Haswell-noTSX:

[delan]

as of kholia/OSX-KVM@ac01120, using the same xml as macos13, macOS 14 gets stuck in a hang and boot loop after the first three stages of installation:

per the OSX-KVM docs, we needed to change the CPU from Penryn to Haswell-noTSX:

same goes for macOS 15:

changing the CPU to Haswell-noTSX fixes this:

[delan]

on macOS 15, our initial automation script fails:

[delan]

as of a9bdc3e, macOS 14 and 15 images are ready for testing:

[jschwe]

triage: What is the status of this issue? The last post suggests that this may be done (albeit perhaps not used in servo?)

[delan]

iirc i got the images to build, but they still needed testing with real jobs, which i was planning to do in #39455. that never happened, and eventually we stopped running these images in prod to free up resources.