Fix: success message and scroll after adding panel from library (#220122)

Initially there was no success message for any type in the library and
there was no scrolling to added panel.

This change sets displaySuccessMessage to true for each plugin
registered in the Add from Library flyout.

It ensures that:
- users see a success toast after adding a panel,
- the newly added panel is automatically scrolled into view.

Closes: #188775

---------

Co-authored-by: kibanamachine <42973632+kibanamachine@users.noreply.github.com>

examples/embeddable_examples/public/react_embeddables/register_saved_object_example.ts

@@ -16,12 +16,15 @@ const APP_ICON = 'logoKibana';
 export const registerMyEmbeddableSavedObject = (embeddableSetup: EmbeddableSetup) =>
   embeddableSetup.registerAddFromLibraryType({
     onAdd: (container, savedObject) => {
-      container.addNewPanel({
-        panelType: MY_EMBEDDABLE_TYPE,
-        serializedState: {
-          rawState: savedObject.attributes,
+      container.addNewPanel(
+        {
+          panelType: MY_EMBEDDABLE_TYPE,
+          serializedState: {
+            rawState: savedObject.attributes,
+          },
         },
-      });
+        true // shows a toast and scrolls to panel
+      );
     },
     savedObjectType: MY_SAVED_OBJECT_TYPE,
     savedObjectName: 'Some saved object',