
Some users have their Xcode settings set to not debug (see example here https://github.com/flutter/flutter/issues/136197#issuecomment-1766834195). This will cause the [engine check for a debugger](22ce5c6a45/runtime/ptrace_check.cc (L56-L71)
) to fail, which will cause an error and cause the app to crash.
This PR parses the scheme file to ensure the scheme is set to start a debugger and warn the user if it's not.
Fixes https://github.com/flutter/flutter/issues/136197.