Automatically focus the execute button in the DacFx wizard summary screens (#6984)

* Focus piping for extension buttons

* Focus the done button when entering the summary page for DacFx wizard

* Adding internal value resets for extension-side button model.

* Correcting remark string

src/sql/azdata.d.ts

@@ -3624,6 +3624,11 @@ declare module 'azdata' {
 			 */
 			hidden: boolean;
 
+			/**
+			 * Whether the button is focused
+			 */
+			focused?: boolean;
+
 			/**
 			 * Raised when the button is clicked
 			 */