Version hash should include the image from launchPlan.workflow.nodes (#3290)

Signed-off-by: Kevin Su <pingsutw@apache.org>

Author: pingsutw

flytekit/remote/remote.py

@@ -1338,6 +1338,11 @@ def _get_image_names(entity: typing.Union[PythonAutoContainerTask, WorkflowBase]
             for n in entity.nodes:
                 image_names.extend(FlyteRemote._get_image_names(n.flyte_entity))
             return image_names
+        if isinstance(entity, LaunchPlan):
+            image_names = []
+            for n in entity.workflow.nodes:
+                image_names.extend(FlyteRemote._get_image_names(n.flyte_entity))
+            return image_names
         return []
 
     @staticmethod