feat(preview): add command to cleanup preview folder #12291

Job	Run time
changes	5s
integration-sqlite (capabilities_features, 8.1, main)	2m 32s
integration-sqlite (collaboration_features, 8.1, main)	4m 17s
integration-sqlite (comments_features, 8.1, main)	3m 8s
integration-sqlite (dav_features, 8.1, main)	6m 17s
integration-sqlite (features, 8.1, main)	7m 38s
integration-sqlite (federation_features, 8.1, main)	4m 56s
integration-sqlite (--tags ~@large files_features, 8.1, main)	10m 52s
integration-sqlite (filesdrop_features, 8.1, main)	2m 36s
integration-sqlite (openldap_features, 8.1, main)	2m 52s
integration-sqlite (openldap_numerical_features, 8.1, main)	2m 37s
integration-sqlite (ldap_features, 8.1, main)	2m 43s
integration-sqlite (remoteapi_features, 8.1, main)	2m 0s
integration-sqlite (setup_features, 8.1, main)	2m 16s
integration-sqlite (sharees_features, 8.1, main)	5m 2s
integration-sqlite (sharing_features, 8.1, main)	14m 4s
integration-sqlite (videoverification_features, 8.1, main)	5m 12s
integration-sqlite-summary	4s
	1h 19m 11s

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