fix(TemplateManager): Make sure TemplateFolder is a Folder #15370

Job	Run time
changes	6s
integration-sqlite (capabilities_features, 8.1, main)	1m 39s
integration-sqlite (collaboration_features, 8.1, main)	2m 18s
integration-sqlite (comments_features, 8.1, main)	1m 38s
integration-sqlite (dav_features, 8.1, main)	7m 53s
integration-sqlite (features, 8.1, main)	7m 40s
integration-sqlite (federation_features, 8.1, main)	4m 23s
integration-sqlite (--tags ~@large files_features, 8.1, main)	8m 37s
integration-sqlite (filesdrop_features, 8.1, main)	1m 9s
integration-sqlite (openldap_features, 8.1, main)	1m 35s
integration-sqlite (openldap_numerical_features, 8.1, main)	1m 46s
integration-sqlite (ldap_features, 8.1, main)	1m 26s
integration-sqlite (remoteapi_features, 8.1, main)	1m 26s
integration-sqlite (setup_features, 8.1, main)	1m 6s
integration-sqlite (sharees_features, 8.1, main)	5m 6s
integration-sqlite (sharing_features, 8.1, main)	18m 31s
integration-sqlite (videoverification_features, 8.1, main)	4m 56s
integration-sqlite-summary	5s
	1h 11m 20s

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