[topic/Go2] remove front hip collision mesh as it is in the body

cmake

robots/go2_description/collisions/base_body_convex.stl

robots/go2_description/collisions/base_fl_support_convex.stl

robots/go2_description/collisions/base_fr_support_convex.stl

robots/go2_description/collisions/base_head_convex.stl

robots/go2_description/collisions/base_neck_convex.stl

robots/go2_description/collisions/base_rl_support_convex.stl

robots/go2_description/collisions/base_rr_support_convex.stl

robots/go2_description/urdf/go2.urdf