feat: use task processing to send emails #35549

Job	Run time
changes	24s
integration-sqlite (capabilities_features, 8.4, main, master)	2m 19s
integration-sqlite (filesdrop_features, 8.4, main, master)	2m 3s
integration-sqlite (comments_features, 8.4, main, master)	3m 8s
integration-sqlite (features, 8.4, main, master)	18m 44s
integration-sqlite (federation_features, 8.4, main, master)	8m 29s
integration-sqlite (--tags ~@large files_features, 8.4, main, master)	24m 49s
integration-sqlite (openldap_features, 8.4, main, master)	2m 6s
integration-sqlite (remoteapi_features, 8.4, main, master)	1m 14s
integration-sqlite (collaboration_features, 8.4, main, master)	4m 27s
integration-sqlite (file_conversions, 8.4, main, master)	2m 28s
integration-sqlite (setup_features, 8.4, main, master)	1m 24s
integration-sqlite (sharees_features, 8.4, main, master)	11m 49s
integration-sqlite (files_reminders, 8.4, main, master)	1m 45s
integration-sqlite (openldap_numerical_features, 8.4, main, master)	2m 20s
integration-sqlite (routing_features, 8.4, main, master)	3m 15s
integration-sqlite (videoverification_features, 8.4, main, master)	8m 43s
integration-sqlite (sharing_features, 8.4, main, master)	31m 8s
integration-sqlite (ldap_features, 8.4, main, master)	2m 42s
integration-sqlite (theming_features, 8.4, main, master)	2m 56s
integration-sqlite (dav_features, 8.4, main, master)	11m 44s
integration-sqlite-summary	6s
	2h 28m 3s

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