add cleanup cronjob for spaces leftover from integration tests #2770

Job	Run time
Store event file	3s
Unit tests / Unit tests	3m 10s
Security tests / Security tests	1m 21s
Integration tests / Integration tests (v1.28.9, minikube)	5m 24s
Integration tests / Integration tests (v1.29.4, minikube)	6m 13s
Integration tests / Integration tests (v1.29.4, k3d)	5m 3s
Integration tests / Integration tests (v1.28.9, k3d)	4m 48s
Integration tests / Send Discord notification	0s
	26m 2s

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