A forest of eucalyptus trees planted decades ago gave Laguna Beach’s Forest Avenue its name, and when the city chopped down nearly 10 of them this week, the community says part of the charm is gone. On Monday night, nine mature trees were cut down on one block where a new pedestrian promenade is being built. City leaders say the removal was necessary for safety reasons. A eucalyptus on the same block fell in March. But people who live and work in town say they were blindsided.