The iOS-SE scheme has run with Address Sanitizer since the schemes were
first committed to set the architecture override, which was incidental.
An ExtensionKit extension linked with the sanitizer does not start on a
device, so every qemu-img operation of UTM SE failed when run from
Xcode. Turn it off, add the schemes Xcode created for the helper targets
so both can be built and debugged on their own, and take the Metal API
validation setting Xcode 27 writes into the macOS scheme.
Assisted-by: Claude:claude-fable-5-1
* Old design now only built in Legacy scheme
* New iOS scheme targets iOS 14 and macOS scheme targets macOS 11
* Added stubs for Legacy not supported Swift bridge features
* Made UTMConfiguration Objective-C code more friendly to Swift