MM-56083 Add PatchMultipleMembersNotifyProps plugin API (#25690)

* Add ChannelStore.UpdateMultipleMembersNotifyProps

* Make UpdateMultipleMembersNotifyProps return updated values from the DB

* Add UpdateChannelMembersNotifications plugin API

* Extract i18n

* Fix style

* Make layers

* Change to PatchMultipleMembersNotifyProps

* Add limit to PatchChannelMembersNotifyProps

* Add additional unit tests

* Address feedback

* Lowercase decodeJSON

* Have PatchMultipleMembersNotifyProps update LastUpdateAt

* Fix tests that relied on unreliable return order

* Fix i18n

server/channels/store/timerlayer/timerlayer.go

@@ -1950,6 +1950,22 @@ func (s *TimerLayerChannelStore) MigrateChannelMembers(fromChannelID string, fro
 	return result, err
 }
 
+func (s *TimerLayerChannelStore) PatchMultipleMembersNotifyProps(members []*model.ChannelMemberIdentifier, notifyProps map[string]string) ([]*model.ChannelMember, error) {
+	start := time.Now()
+
+	result, err := s.ChannelStore.PatchMultipleMembersNotifyProps(members, notifyProps)
+
+	elapsed := float64(time.Since(start)) / float64(time.Second)
+	if s.Root.Metrics != nil {
+		success := "false"
+		if err == nil {
+			success = "true"
+		}
+		s.Root.Metrics.ObserveStoreMethodDuration("ChannelStore.PatchMultipleMembersNotifyProps", success, elapsed)
+	}
+	return result, err
+}
+
 func (s *TimerLayerChannelStore) PermanentDelete(ctx request.CTX, channelID string) error {
 	start := time.Now()