Fixed #31136 -- Disabled grouping by aliases on QuerySet.values()/values_list().

Regression in fb3f034f1c.

Thanks Sigurd Ljødal for the report.

tests/aggregation/tests.py

@@ -1151,6 +1151,20 @@ class AggregateTestCase(TestCase):
         )
         self.assertTrue(publisher_qs.exists())
 
+    def test_aggregation_exists_annotation(self):
+        published_books = Book.objects.filter(publisher=OuterRef('pk'))
+        publisher_qs = Publisher.objects.annotate(
+            published_book=Exists(published_books),
+            count=Count('book'),
+        ).values_list('name', flat=True)
+        self.assertCountEqual(list(publisher_qs), [
+            'Apress',
+            'Morgan Kaufmann',
+            "Jonno's House of Books",
+            'Prentice Hall',
+            'Sams',
+        ])
+
     @skipUnlessDBFeature('supports_subqueries_in_group_by')
     def test_group_by_subquery_annotation(self):
         """