refactor: Reduce complexity of `TemplateLayout` constructor #12506

Job	Run time
changes	6s
integration-sqlite (capabilities_features, 8.1, main)	2m 49s
integration-sqlite (collaboration_features, 8.1, main)	1m 49s
integration-sqlite (comments_features, 8.1, main)	1m 27s
integration-sqlite (dav_features, 8.1, main)	4m 39s
integration-sqlite (features, 8.1, main)	5m 51s
integration-sqlite (federation_features, 8.1, main)	2m 35s
integration-sqlite (--tags ~@large files_features, 8.1, main)	7m 36s
integration-sqlite (filesdrop_features, 8.1, main)	56s
integration-sqlite (openldap_features, 8.1, main)	3m 0s
integration-sqlite (openldap_numerical_features, 8.1, main)	2m 37s
integration-sqlite (ldap_features, 8.1, main)	15m 35s
integration-sqlite (remoteapi_features, 8.1, main)	2m 41s
integration-sqlite (setup_features, 8.1, main)	50s
integration-sqlite (sharees_features, 8.1, main)	5m 26s
integration-sqlite (sharing_features, 8.1, main)	18m 42s
integration-sqlite (videoverification_features, 8.1, main)	5m 59s
integration-sqlite-summary	5s
	1h 22m 43s

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