MM-62751: [Shared Channels] Allow remote users to be discoverable in the create DM/GM modal (#30918)

server/channels/store/store.go

@@ -562,6 +562,7 @@ type RemoteClusterStore interface {
 	GetAll(offset, limit int, filter model.RemoteClusterQueryFilter) ([]*model.RemoteCluster, error)
 	UpdateTopics(remoteClusterID string, topics string) (*model.RemoteCluster, error)
 	SetLastPingAt(remoteClusterID string) error
+	UpdateLastGlobalUserSyncAt(remoteID string, syncAt int64) error
 }
 
 type ComplianceStore interface {