fix: catch ElevatorIsBrokenException to avoid main thread to stop running

elevator-core/src/main/java/elevator/Building.java

...or-core/src/main/java/elevator/engine/ElevatorEngine.java

...or-server/src/main/java/elevator/server/ElevatorGame.java

...erver/src/test/java/elevator/server/ElevatorGameTest.java