[wip] Support sharding migration #14652

Job	Run time
changes	7s
integration-sqlite (capabilities_features, 8.1, main)	1m 35s
integration-sqlite (collaboration_features, 8.1, main)	2m 49s
integration-sqlite (comments_features, 8.1, main)	1m 29s
integration-sqlite (dav_features, 8.1, main)	5m 26s
integration-sqlite (features, 8.1, main)	6m 5s
integration-sqlite (federation_features, 8.1, main)	3m 46s
integration-sqlite (--tags ~@large files_features, 8.1, main)	12m 40s
integration-sqlite (filesdrop_features, 8.1, main)	1m 37s
integration-sqlite (openldap_features, 8.1, main)	1m 37s
integration-sqlite (openldap_numerical_features, 8.1, main)	1m 45s
integration-sqlite (ldap_features, 8.1, main)	1m 44s
integration-sqlite (remoteapi_features, 8.1, main)	1m 35s
integration-sqlite (setup_features, 8.1, main)	1m 12s
integration-sqlite (sharees_features, 8.1, main)	3m 56s
integration-sqlite (sharing_features, 8.1, main)	12m 7s
integration-sqlite (videoverification_features, 8.1, main)	3m 39s
integration-sqlite-summary	5s
	1h 3m 14s

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