Allow standard users to execute installer operations

Allows users without administrator permissions to manage their Visual Studio installations. If set to 0 (disabled) or missing entirely, the installer will prompt for administrator permissions using UAC. If set to 1 (enabled for Update and Rollback), users without administrator permissions can update or rollback without UAC. All other operations will ask for administrator permissions through UAC. If set to 2 (enabled for all installer operations), users without administrator permissions can fully manage Visual Studio through the Visual Studio Installer without UAC. For more information, see https://aka.ms/vs/setup/policies.