fix enroll and reenroll relationship

enrollments-events/app/events/reenroll_if_failed.py

@@ -10,7 +10,7 @@ from layercake.dynamodb import DynamoDBPersistenceLayer, SortKey, TransactKey
 
 from boto3clients import dynamodb_client
 from config import ENROLLMENT_TABLE
-from enrollment import LinkedEntity, enroll
+from enrollment import Kind, LinkedEntity, enroll
 from schemas import Course, Enrollment, User
 
 logger = Logger(__name__)
@@ -52,7 +52,12 @@ def lambda_handler(event: EventBridgeEvent, context: LambdaContext) -> bool:
             'offset_days': metadata['dedup_window_offset_days'],
         },
         linked_entities=frozenset(
-            {LinkedEntity(new_image['id'], 'ENROLLMENT')},
+            {
+                LinkedEntity(
+                    id=new_image['id'],
+                    kind=Kind.ENROLLMENT,
+                ),
+            },
         ),
         persistence_layer=dyn,
     )