[MM-62004] update threads after a channel gets moved (#29624)

server/channels/store/store.go

@@ -360,6 +360,7 @@ type ThreadStore interface {
 
 	SaveMultipleMemberships(memberships []*model.ThreadMembership) ([]*model.ThreadMembership, error)
 	MaintainMultipleFromImport(memberships []*model.ThreadMembership) ([]*model.ThreadMembership, error)
+	UpdateTeamIdForChannelThreads(channelId, teamId string) error
 }
 
 type PostStore interface {