fix(dav): Strip DTSTAMP before etag comparison in webcal refresh #40065

Job	Run time
changes	14s
integration-sqlite (capabilities_features, 8.4, main, master)	2m 53s
integration-sqlite (federation_features, 8.4, main, master)	5m 15s
integration-sqlite (files_reminders, 8.4, main, master)	1m 12s
integration-sqlite (comments_features, 8.4, main, master)	3m 27s
integration-sqlite (openldap_numerical_features, 8.4, main, master)	2m 13s
integration-sqlite (openldap_features, 8.4, main, master)	3m 12s
integration-sqlite (videoverification_features, 8.4, main, master)	5m 52s
integration-sqlite (theming_features, 8.4, main, master)	3m 7s
integration-sqlite (ldap_features, 8.4, main, master)	2m 22s
integration-sqlite (dav_features, 8.4, main, master)	11m 17s
integration-sqlite (remoteapi_features, 8.4, main, master)	1m 27s
integration-sqlite (sharing_features, 8.4, main, master)	29m 34s
integration-sqlite (sharees_features, 8.4, main, master)	19m 24s
integration-sqlite (features, 8.4, main, master)	19m 2s
integration-sqlite (file_conversions, 8.4, main, master)	2m 4s
integration-sqlite (setup_features, 8.4, main, master)	1m 45s
integration-sqlite (filesdrop_features, 8.4, main, master)	1m 51s
integration-sqlite (--tags ~@large files_features, 8.4, main, master)	25m 7s
integration-sqlite (collaboration_features, 8.4, main, master)	4m 2s
integration-sqlite (routing_features, 8.4, main, master)	1m 32s
integration-sqlite-summary	6s
	2h 26m 58s

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