Refactor `OC\Server::getTrustedDomainHelper` #1234

Job	Run time
changes	5s
integration-sqlite (capabilities_features, 8.2, main)	1m 0s
integration-sqlite (collaboration_features, 8.2, main)	1m 53s
integration-sqlite (comments_features, 8.2, main)	6m 30s
integration-sqlite (dav_features, 8.2, main)	12m 32s
integration-sqlite (features, 8.2, main)	14m 5s
integration-sqlite (federation_features, 8.2, main)	2m 27s
integration-sqlite (--tags ~@large files_features, 8.2, main)	19m 31s
integration-sqlite (filesdrop_features, 8.2, main)	4m 38s
integration-sqlite (openldap_features, 8.2, main)	5m 49s
integration-sqlite (openldap_numerical_features, 8.2, main)	1m 4s
integration-sqlite (ldap_features, 8.2, main)	5m 22s
integration-sqlite (remoteapi_features, 8.2, main)	4m 14s
integration-sqlite (setup_features, 8.2, main)	4m 16s
integration-sqlite (sharees_features, 8.2, main)	2m 28s
integration-sqlite (sharing_features, 8.2, main)	10m 24s
integration-sqlite (videoverification_features, 8.2, main)	3m 12s
integration-sqlite-summary	9s
	1h 39m 39s

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