[device_mesh][BE] reduce_scatter fallback to funcol and remove from DM (#105642)
For the reason similar to https://github.com/pytorch/pytorch/pull/105605
Pull Request resolved: https://github.com/pytorch/pytorch/pull/105642
Approved by: https://github.com/kumpera, https://github.com/wz337, https://github.com/fduwjj
