Goal

Expand the maintenance job running in the worker namespace to:

1. Clean up orphaned instances
2. Clean up orphaned security groups
3. Clean up orphaned launch templates

Security groups and launch templates can be removed if they're not in use by any instance, and are older than an hour. Orphaned instances can be cleaned up if the parent instance (instance id of the parent is discoverable in the tag with the name "parent") no longer exists.