Add cron to cleanup dangling single tests and batch periodic test reports #1608

Job	Run time
build-docker (internet.nl, docker/Dockerfile, app)	1m 43s
build-docker (unbound, docker/Dockerfile, unbound)	1m 5s
build-docker (linttest, docker/Dockerfile, linttest)	2m 32s
build-docker (test-runner, docker/test-runner.Dockerfile)	1m 26s
build-docker (webserver, docker/webserver.Dockerfile)	1m 41s
build-docker (grafana, docker/grafana.Dockerfile)	1m 8s
build-docker (util, docker/util.Dockerfile)	1m 10s
integration-test	3m 34s
docs	1s
development-environment-test	2m 16s
batch-integration-test	3m 1s
lint/check	58s
test	2m 28s
	23m 3s

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