Implement lightweight method to check is peer has update channel (#1351)

Instead of GetAllConnectedPeers that need to traverse the whole
connections map in order to find one channel there.

management/server/mock_server/account_mock.go

@@ -81,6 +81,7 @@ type MockAccountManager struct {
 	SyncPeerFunc                    func(sync server.PeerSync) (*nbpeer.Peer, *server.NetworkMap, error)
 	InviteUserFunc                  func(accountID string, initiatorUserID string, targetUserEmail string) error
 	GetAllConnectedPeersFunc        func() (map[string]struct{}, error)
+	HasConnectedChannelFunc         func(peerID string) bool
 	GetExternalCacheManagerFunc     func() server.ExternalCacheManager
 }
 
@@ -622,6 +623,14 @@ func (am *MockAccountManager) GetAllConnectedPeers() (map[string]struct{}, error
 	return nil, status.Errorf(codes.Unimplemented, "method GetAllConnectedPeers is not implemented")
 }
 
+// HasconnectedChannel mocks HasConnectedChannel of the AccountManager interface
+func (am *MockAccountManager) HasConnectedChannel(peerID string) bool {
+	if am.HasConnectedChannelFunc != nil {
+		return am.HasConnectedChannelFunc(peerID)
+	}
+	return false
+}
+
 // StoreEvent mocks StoreEvent of the AccountManager interface
 func (am *MockAccountManager) StoreEvent(initiatorID, targetID, accountID string, activityID activity.Activity, meta map[string]any) {
 	if am.StoreEventFunc != nil {