Move from Ninja to Ninja Multi-Config

[angela28chen]

This is to make the directory structure of the build folder more similar across different platform, since on Windows we use Visual Studio which is Multi-Config.

Announcements:

• CMAKE_BUILD_TYPE removed and disallowed, do not use this flag anymore
• Now we require installing host tools under install/ as part of the build process, check out the updated documentation

Changes:

• Switched generators ("Ninja" -> "Ninja Multi-Config") when using cmake to generate build files for:
  • Host tools (host platforms: Linux/macOS, Windows remains VS generator)
  • Device resources (host platforms: Linux/macOS/Windows)
• Updated scripts, documentation
• Updated github workflows
  • Added new step to run cmake install
• Renamed regression test "Regression_StackOverflow_MacOS" -> "Regression_StackOverflow" because it runs on all host platforms and the name is misleading

[angela28chen]

Manual Testing (2025/12/22 7:00PM)

• Windows
  • UI/CLI version verified
• macOS
  • UI/CLI version verified

[wangra-google]

Thanks for making this change. so much cleaner!

[angela28chen]

Note that the internal release process documentation we have will need to be updated, but I plan to do that at the end of this series of changes.