Is your feature request related to a problem? Please describe.
During workspace creation on IDX, we're looking to use Dart's recommended settings to give users the best experience out of the box. When we execute the command from our extension, it shows a dialog that clutters the creation flow. It would be helpful to be able to call the command silently.

Describe the solution you'd like
Add a "silent" flag to the "Use Recommended Settings" command that defaults to false but can be set to true when called programmatically from a different extension.

Describe alternatives you've considered
Maintaining a separate copy of the recommended settings in IDX that would need to be maintained to be kept in line with Dart's recommended settings.