[Infra] Migrate Storage CI to Xcode 16

[ncooke3]

#no-changelog

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[ncooke3]

one caveat with this. the default xcode version on macos 15 is Xcode 16.0.

while it's not critical for source based builds, we could either:

• explicitly set the Xcode version for all macos 15 jobs
• only set it when needed (build uses binary built with Xcode 16.2)

[ncooke3]

Interesting, looks like Xcode 16.3 didn't work:

Run sudo xcode-select -s /Applications/Xcode_16.3.app/Contents/Developer
  sudo xcode-select -s /Applications/Xcode_16.3.app/Contents/Developer
  shell: /bin/bash -e {0}
  env:
    PATH: /Users/runner/.local/bin:/opt/homebrew/bin:/opt/homebrew/sbin:/Users/runner/.cargo/bin:/usr/local/opt/curl/bin:/usr/local/bin:/usr/local/sbin:/Users/runner/bin:/Users/runner/.yarn/bin:/Users/runner/Library/Android/sdk/tools:/Users/runner/Library/Android/sdk/platform-tools:/Library/Frameworks/Python.framework/Versions/Current/bin:/Library/Frameworks/Mono.framework/Versions/Current/Commands:/usr/bin:/bin:/usr/sbin:/sbin:/Users/runner/.dotnet/tools
xcode-select: error: invalid developer directory '/Applications/Xcode_16.3.app/Contents/Developer'

[paulb777]

Looks like a unit test problem on macOS 14