fix: use correct KillMode for validation service to make sure there are no...

fix: use correct KillMode for validation service to make sure there are no remaining processes from the Cgroup after stopping the service

templates/usr/local/lib/systemd/system/validation_daemon_@.service.j2

@@ -11,7 +11,7 @@ ExecStart=/usr/local/bin/validate_workflow.sh \
 	--stage upcoming \
 	--daemon
 ExecReload=/bin/kill -HUP $MAINPID
-KillMode=process
+KillMode=control-group
 Restart=on-failure
 User={{ vault_service_user }}
 Group={{ vault_service_group }}