refactor(dav): Clean up QuotaPlugin and add new hints #31255

Job	Run time
changes	9s
integration-sqlite (comments_features, 8.1, main, master)	2m 38s
integration-sqlite (federation_features, 8.1, main, master)	3m 4s
integration-sqlite (features, 8.1, main, master)	7m 29s
integration-sqlite (--tags ~@large files_features, 8.1, main, master)	18m 25s
integration-sqlite (dav_features, 8.1, main, master)	6m 28s
integration-sqlite (ldap_features, 8.1, main, master)	1m 30s
integration-sqlite (sharees_features, 8.1, main, master)	4m 11s
integration-sqlite (openldap_numerical_features, 8.1, main, master)	2m 17s
integration-sqlite (capabilities_features, 8.1, main, master)	2m 19s
integration-sqlite (file_conversions, 8.1, main, master)	2m 34s
integration-sqlite (filesdrop_features, 8.1, main, master)	1m 19s
integration-sqlite (sharing_features, 8.1, main, master)	16m 41s
integration-sqlite (remoteapi_features, 8.1, main, master)	2m 13s
integration-sqlite (videoverification_features, 8.1, main, master)	3m 28s
integration-sqlite (theming_features, 8.1, main, master)	2m 32s
integration-sqlite (setup_features, 8.1, main, master)	1m 40s
integration-sqlite (collaboration_features, 8.1, main, master)	4m 20s
integration-sqlite (routing_features, 8.1, main, master)	2m 40s
integration-sqlite (openldap_features, 8.1, main, master)	1m 14s
integration-sqlite-summary	5s
	1h 27m 16s

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