Update `register` command from registration page
Description
Note: Depends on gitlab-runner#30840 (closed)
In the new runner register page, e.g. (http://gdk.test:3000/admin/runners/401/register?platform=linux)
The runner command should be simplified.
Change from
gitlab-runner register --url http://gdk.test:3000 --registration-token glrt-JvJgsuWYruzCnzJAProN --description 'My runner'
To
gitlab-runner register --url http://gdk.test:3000 --token glrt-JvJgsuWYruzCnzJAProN
Edited by Miguel Rincon