[Dashboard] Unlink from library / Save to library actions do not work… (

#150338)

… for maximized panels #139915

## Summary
As suggested in the issue comments
#139915 (comment),
in this PR I added some logic after linking/unlinking to the library to
set the expanded visualization id to undefined.

After testing this changes in a local development environment, the
visualization is no longer disappearing from the dashboard after
linking/unlinking to the library

src/plugins/dashboard/public/dashboard_actions/add_to_library_action.tsx

@@ -97,6 +97,9 @@ export class AddToLibraryAction implements Action<AddToLibraryActionContext> {
     const title = dashboardAddToLibraryActionStrings.getSuccessMessage(
       embeddable.getTitle() ? `'${embeddable.getTitle()}'` : ''
     );
+    if (dashboard.getExpandedPanelId() !== undefined) {
+      dashboard.setExpandedPanelId(undefined);
+    }
     this.toastsService.addSuccess({
       title,
       'data-test-subj': 'addPanelToLibrarySuccess',

src/plugins/dashboard/public/dashboard_actions/unlink_from_library_action.tsx

@@ -91,6 +91,9 @@ export class UnlinkFromLibraryAction implements Action<UnlinkFromLibraryActionCo
     const title = dashboardUnlinkFromLibraryActionStrings.getSuccessMessage(
       embeddable.getTitle() ? `'${embeddable.getTitle()}'` : ''
     );
+    if (dashboard.getExpandedPanelId() !== undefined) {
+      dashboard.setExpandedPanelId(undefined);
+    }
 
     this.toastsService.addSuccess({
       title,