Fix API issues for external extensions (#14796)

* Fix azdata API break

* Move dialogwidth to azdata.d.ts

* re-add parameter

* add comment back

src/sql/azdata.d.ts

@@ -3916,6 +3916,11 @@ declare module 'azdata' {
 			Information = 2
 		}
 
+		/**
+		 * The width of a dialog, either from a predetermined size list or a specific size (such as px)
+		 */
+		export type DialogWidth = 'narrow' | 'medium' | 'wide' | number | string;
+
 		/**
 		 * A message shown in a dialog. If the level is not set it defaults to error.
 		 */