macOS 14 Sonoma and Xcode 15 image support
## Release notes
Using our [SaaS runners on macOS](https://docs.gitlab.com/ee/ci/runners/saas/macos_saas_runner.html#supported-macos-images), you can now build applications that require macOS in a secure, on-demand GitLab Runner build environment that's fully integrated with GitLab CI/CD on macOS 14 and Xcode 15.
Try it out today by using `macos-14-xcode-15` as the image in your .gitlab-ci.yml file.
## Description
As a macOS SaaS runner user, I would like to use the recently released macOS 14 with Xcode 15 as `macos-14-xcode-15`.
issue