Migrates the project to Xcode 15 and Apple Silicon in CI
Note: I've disabled a flaky test that's caused us issues before – I can't repro the issue locally, but this one has always been a problem, so I'd prefer to just try a different approach at a later time (separated from this CI change)
Testing Details
Ensure CI passes
[x] Please check here if your pull request includes additional test coverage.
[x] I have considered if this change warrants release notes and have added them to the appropriate section in the CHANGELOG.md if necessary.
Migrates the project to Xcode 15 and Apple Silicon in CI
Note: I've disabled a flaky test that's caused us issues before – I can't repro the issue locally, but this one has always been a problem, so I'd prefer to just try a different approach at a later time (separated from this CI change)
Testing Details
Ensure CI passes
CHANGELOG.mdif necessary.