Refactor `OC\Server::getEncryptionFilesHelper` #5348

Job	Run time
changes	7s
integration-sqlite (capabilities_features, 8.2, main)	5m 19s
integration-sqlite (collaboration_features, 8.2, main)	7m 21s
integration-sqlite (comments_features, 8.2, main)	7m 22s
integration-sqlite (dav_features, 8.2, main)	13m 56s
integration-sqlite (features, 8.2, main)	15m 55s
integration-sqlite (federation_features, 8.2, main)	9m 31s
integration-sqlite (--tags ~@large files_features, 8.2, main)	19m 21s
integration-sqlite (filesdrop_features, 8.2, main)	6m 14s
integration-sqlite (openldap_features, 8.2, main)	5m 27s
integration-sqlite (openldap_numerical_features, 8.2, main)	6m 7s
integration-sqlite (ldap_features, 8.2, main)	6m 20s
integration-sqlite (remoteapi_features, 8.2, main)	5m 45s
integration-sqlite (setup_features, 8.2, main)	5m 25s
integration-sqlite (sharees_features, 8.2, main)	9m 46s
integration-sqlite (sharing_features, 8.2, main)	29m 52s
integration-sqlite (videoverification_features, 8.2, main)	10m 52s
integration-sqlite-summary	6s
	2h 44m 46s

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