Dataflow Gen1 support for Save As Dataflow Gen2 new item

Customers often would like to recreate an existing Dataflow Gen1 item as a new Dataflow Gen2 item. Today, in order to accomplish this, they need to create the new Dataflow Gen2 item from scratch and copy-paste their existing queries, or leverage the Export/Import Power Query template capabilities. This, however, is not only inconvenient due to unnecessary steps, but it also does not carry over additional dataflow settings, such as Scheduled Refresh and other item properties (name, description, sensitivity label, etc.).As part of this enhancement, we will provide a quick ""Save As"" gesture within the Dataflow Gen1 editing experience, allowing users to save their existing Dataflow Gen1 item as a new Dataflow Gen2 item.