feat: create Mailjet lists for travel mailings

config/packages/zenstruck_schedule.yaml

@@ -29,6 +29,10 @@ zenstruck_schedule:
       frequency: "45 1 * * *"
       description: "Removes expired pending newsletter double opt-in requests"
 
+    - task: app:cleanup:travel-mailing-lists
+      frequency: "50 1 * * *"
+      description: "Deletes Mailjet travel mailing lists and their orphaned contacts 30 days after the travel started"
+
     - task: league:oauth2-server:clear-expired-tokens
       frequency: "0 * * * *"
       description: "Removes expired oauth2 tokens hourly"