Stop VSCode appending file associations to settings.json (#21944)
### Description
If you open onnxruntime source code using VSCode with C/C++ extension,
it's keeping adding file associations for C/C++ headers into this
settings.json. This is annoying when staging/committing changes.
Add a configuration to disable this behavior.
see:
-
https://stackoverflow.com/questions/65220185/how-to-stop-vs-code-to-keep-adding-standard-c-libraries-to-the-file-associatio
-
https://github.com/microsoft/vscode-cpptools/issues/722#issuecomment-480329005
8c5336449d