Remove query to update channel extra_update_at field on user activation/deactivation (#8415)

store/store.go

@@ -153,7 +153,6 @@ type ChannelStore interface {
 	UpdateLastViewedAt(channelIds []string, userId string) StoreChannel
 	IncrementMentionCount(channelId string, userId string) StoreChannel
 	AnalyticsTypeCount(teamId string, channelType string) StoreChannel
-	ExtraUpdateByUser(userId string, time int64) StoreChannel
 	GetMembersForUser(teamId string, userId string) StoreChannel
 	AutocompleteInTeam(teamId string, term string) StoreChannel
 	SearchInTeam(teamId string, term string) StoreChannel