feat(airflow.cfg): remove deprecated and used session_lifetime_days config

Author: Lee-W

airflow.cfg

@@ -74,15 +74,11 @@ x_frame_enabled = True
 # 0 means never get forcibly logged out
 force_log_out_after = 0
 
-# The UI cookie lifetime in days
-session_lifetime_days = 30
-
 authenticate = False
 auth_backend = airflow.api.auth.backend.default
 
 
 [celery]
-
 # The concurrency that will be used when starting workers with the
 # ``airflow celery worker`` command. This defines the number of task instances that
 # a worker will take, so size up your workers based on the resources on