New user install: missing lidar calibration files

[hello-lamsey]

Issue: after performing a stretch_new_user_install.sh, I had to manually download the lidar calibration files using...

uv run REx_hesai_download_calibration.py --left
uv run REx_hesai_download_calibration.py --right

...from the pyhesai wrapper repo which I downloaded to ~/repos in my new user install.

The absence of the lidar calibration files caused the lidar pointclouds to appear as planes in rviz, and calibrations in stretch4_dual_lidar_calibration also failed as a result.

Suggested fix: add the lidar calibration downloads (which may require the user to enter y in the terminal) to the new user install script

[hello-garv]

Should the pyhesai wrapper be installed on set-up? I had to install it manually to get the hesai_download cli tools.