temp: adding DeprecationWarning to remove neo4j.

cms/djangoapps/coursegraph/apps.py

@@ -3,7 +3,7 @@
 
 Signal handlers are connected here.
 """
-
+import warnings
 
 from django.apps import AppConfig
 
@@ -15,3 +15,11 @@ class CoursegraphConfig(AppConfig):
     name = 'cms.djangoapps.coursegraph'
 
     from cms.djangoapps.coursegraph import tasks
+
+    def ready(self) -> None:
+        warnings.warn(
+            "Neo4j support is going to be dropped after Sumac release,"
+            "to read more here is a github issue https://github.com/openedx/edx-platform/issues/34342",
+            DeprecationWarning,
+            stacklevel=2
+        )