Add a getTargetWorkspace method to flyout_base.ts (#7519)

core/flyout_base.ts

@@ -480,6 +480,15 @@ export abstract class Flyout extends DeleteArea implements IFlyout {
     return this.workspace_;
   }
 
+  /**
+   * Get the target workspace inside the flyout.
+   *
+   * @returns The target workspace inside the flyout.
+   */
+  getTargetWorkspace(): WorkspaceSvg {
+    return this.targetWorkspace;
+  }
+
   /**
    * Is the flyout visible?
    *