Unable to launch practice worlds using run_trial.bash

[ngxingyu]

1. Currently run_trial.bash runs SERVER_CMD="/run_vrx_trial.sh /team_generated/${TEAM_NAME}.urdf /task_generated/worlds/${TASK_NAME}${TRIAL_NUM} ${LOG_DIR}"
   and run_vrx_trial.sh runs
   ros2 launch vrx_gz competition.launch.py headless:=false urdf:=$WAMV_URDF world:=$TRIAL_WORLD extra_gz_args:="--record_period ${RECORD_PERIOD} --record_path /home/developer/.gazebo --log_overwrite" verbose:=true competition_mode:=true > ~/verbose_output.txt 2>&1 & internally,
   However, I suspect competition.launch.py does not seem to support absolute file paths as world, and it only works when I change world to the name of the world e.g. practice_2023_${TASK}${TRIAL}_task where it will use the worlds in the vrx repo.