Tracking Push Notifications in a structured logger (notifications.log) (#10823)

* Remove NotificationRegistry table and use structured logging

* Fix ackId for notification sent

* Notification logger at server level

* Remove unused i18n strings

store/sqlstore/store.go

@@ -99,5 +99,4 @@ type SqlStore interface {
 	UserTermsOfService() store.UserTermsOfServiceStore
 	LinkMetadata() store.LinkMetadataStore
 	getQueryBuilder() sq.StatementBuilderType
-	NotificationRegistry() store.NotificationRegistryStore
 }