☂️ Upgrade to macOS 14, Xcode 16, iOS 18

[vashworth]

macOS Upgrade

• Upgrade 1 arm64 and 1 x86 chromium staging bots to macOS 14.5 #148860
• Upgrade 1 arm64 and 1 x86 devicelab staging bots to macOS 14.5 #148859
• Run all flutter/flutter macOS tests manually on macOS 14.5 bot #148868
  • Add any issues discovered to ☂️ Tracking issue for any infra or test failures with macOS 14 #148882
• Run all flutter/packages macOS tests manually on macOS 14.5 bot #148869
  • Add any issues discovered to ☂️ Tracking issue for any infra or test failures with macOS 14 #148882
• Run all flutter/engine macOS tests manually on macOS 14.5 bot #148877
  • Add any issues discovered to ☂️ Tracking issue for any infra or test failures with macOS 14 #148882
• Update .ci.yaml in flutter/flutter to use either macOS 13 or macOS 14 #148871
• Update .ci.yaml in flutter/packages to use either macOS 13 or macOS 14 #148873
• Update .ci.yaml and configs in flutter/engine to use either macOS 13 or macOS 14 #148879
• Upgrade 50% of devicelab bots in each pool to macOS 14.5 #148881
  • Add any issues discovered to ☂️ Tracking issue for any infra or test failures with macOS 14 #148882
• Upgrade 50% of chromium bots to macOS 14.5 #148891
  • Add any issues discovered to ☂️ Tracking issue for any infra or test failures with macOS 14 #148882
• CP macOS 14 fixes for beta and stable #148886
• Update flutter/packages macOS stable tests to Mac-13 or Mac-14 #149830
• CP ci.yaml and configs to run on either macOS 13 or 14 for beta and stable #148887
• Upgrade 50% of bots in dart-internal to macOS 14.5 #148893
• Upgrade remaining devicelab bots in each pool to macOS 14.5  #148888
• Upgrade remaining chromium bots in each pool to macOS 14.5 #148892
• Upgrade remaining bots in dart-internal to macOS 14.5 #148977
• Re-enable sandboxing for flutter/packages macOS tests #149844

Xcode Upgrade

• Verify Xcode 16 required macOS version is macOS 14.5 or lower. If not, all above macOS Upgrade steps will need to be done again to the required version: https://xcodereleases.com/
• Run all flutter/flutter macOS tests using Xcode 16 and iOS 18 simulator #148899
  • Add any issues discovered to ☂️ Tracking issue for any infra or test failures with Xcode 16 and iOS 18 Simulators #148898
• Run all flutter/packages macOS tests using Xcode 16 and iOS 18 simulator #148901
  • Add any issues discovered to ☂️ Tracking issue for any infra or test failures with Xcode 16 and iOS 18 Simulators #148898
• Run all flutter/engine macOS tests using Xcode 16 and iOS 18 simulator #148906
  • Add any issues discovered to ☂️ Tracking issue for any infra or test failures with Xcode 16 and iOS 18 Simulators #148898
• Update .ci.yaml in flutter/flutter to use Xcode 16 and macOS 14 #148907
  • Add any issues discovered to ☂️ Tracking issue for any infra or test failures with Xcode 16 and iOS 18 Simulators #148898
• Update flutter/packages to use Xcode 16, iOS 18 Simulator, and macOS 14 #148956
  • Add any issues discovered to ☂️ Tracking issue for any infra or test failures with Xcode 16 and iOS 18 Simulators #148898
• Update flutter/engine to use Xcode 16, iOS 18 Simulator, and macOS 14 #148957
  • Add any issues discovered to ☂️ Tracking issue for any infra or test failures with Xcode 16 and iOS 18 Simulators #148898
• CP Xcode 16 and iOS 18 Simulator fixes for beta and stable #148959
• CP ci.yaml and configs to use Xcode 16, iOS 18 Simulator, and macOS 14 for beta and stable #148960
• Skip Xcode automation handling with Xcode 16 and new deployment process #150209

iOS physical device Upgrade

• Upgrade 1 arm64 and x86 macOS 14 devicelab bot in staging pool to iOS 18 #148963
• Run all flutter/flutter iOS devicelab tests using iOS 18 physical device #148967
  • Add any issues discovered to ☂️ Tracking issue for any infra or test failures with iOS 18 physical devices #148966
• Update .ci.yaml in flutter/flutter to use iOS 17 or 18 #148968
• Upgrade 25% of iOS devices to iOS 18 #148969
  • Add any issues discovered to ☂️ Tracking issue for any infra or test failures with iOS 18 physical devices #148966
• Upgrade 50% of iOS devices to iOS 18 #148971
  • Add any issues discovered to ☂️ Tracking issue for any infra or test failures with iOS 18 physical devices #148966
• CP iOS 18 fixes for beta and stable #148972
• CP ci.yaml to use iOS 17 or 18 for beta and stable #148973
• Upgrade remaining iOS devices to iOS 18 #148974
• Update .ci.yaml in flutter/flutter to use iOS 18 only #148975

Linking previous tracking issue for reference: #133207