[Unified search] Unloads selected query if is deleted (#154644)

## Summary

Closes https://github.com/elastic/kibana/issues/151554

Unloads the selected saved query if it is deleted in order to be able to
be re-applied.

![2](https://user-images.githubusercontent.com/17003240/230862209-2ca1e72a-e5ee-44a9-a475-82f453395a20.gif)


### Checklist
- [x] [Unit or functional
tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)
were updated or added to match the most common scenarios

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

src/plugins/unified_search/public/saved_query_management/saved_query_management_list.test.tsx

@@ -158,4 +158,29 @@ describe('Saved query management list component', () => {
     findTestSubject(component, 'delete-saved-query-Test-button').simulate('click');
     expect(component.find('[data-test-subj="confirmModalConfirmButton"]').length).toBeTruthy();
   });
+
+  it('should render the onClearSavedQuery on delete of the current selected query', async () => {
+    const onClearSavedQuerySpy = jest.fn();
+    const newProps = {
+      ...props,
+      loadedSavedQuery: {
+        id: '8a0b7cd0-b0c4-11ec-92b2-73d62e0d28a9',
+        attributes: {
+          title: 'Test',
+          description: '',
+          query: {
+            query: 'category.keyword : "Men\'s Shoes" ',
+            language: 'kuery',
+          },
+          filters: [],
+        },
+      },
+      onClearSavedQuery: onClearSavedQuerySpy,
+    };
+    const component = mount(wrapSavedQueriesListComponentInContext(newProps));
+    await flushEffect(component);
+    findTestSubject(component, 'delete-saved-query-Test-button').simulate('click');
+    findTestSubject(component, 'confirmModalConfirmButton').simulate('click');
+    expect(onClearSavedQuerySpy).toBeCalled();
+  });
 });

src/plugins/unified_search/public/saved_query_management/saved_query_management_list.tsx

@@ -174,6 +174,7 @@ export function SavedQueryManagementList({
 
         if (loadedSavedQuery && loadedSavedQuery.id === savedQueryId) {
           onClearSavedQuery();
+          setSelectedSavedQuery(undefined);
         }
 
         await savedQueryService.deleteSavedQuery(savedQueryId);