fix: Autodetect legacy filekey instead of trusting the header for legacy header #5431

Job	Run time
changes	8s
integration-sqlite (capabilities_features, 8.2, main)	5m 46s
integration-sqlite (collaboration_features, 8.2, main)	7m 52s
integration-sqlite (comments_features, 8.2, main)	7m 52s
integration-sqlite (dav_features, 8.2, main)	14m 11s
integration-sqlite (features, 8.2, main)	15m 44s
integration-sqlite (federation_features, 8.2, main)	10m 54s
integration-sqlite (--tags ~@large files_features, 8.2, main)	6m 26s
integration-sqlite (filesdrop_features, 8.2, main)	5m 37s
integration-sqlite (openldap_features, 8.2, main)	5m 15s
integration-sqlite (openldap_numerical_features, 8.2, main)	5m 34s
integration-sqlite (ldap_features, 8.2, main)	5m 40s
integration-sqlite (remoteapi_features, 8.2, main)	5m 11s
integration-sqlite (setup_features, 8.2, main)	5m 25s
integration-sqlite (sharees_features, 8.2, main)	9m 51s
integration-sqlite (sharing_features, 8.2, main)	10m 41s
integration-sqlite (videoverification_features, 8.2, main)	10m 37s
integration-sqlite-summary	5s
	2h 12m 49s

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