♻️ replace deprecated functions for communication (#2995)
* :hankey: drop dead code
* :recycle: replace has_all_gather_base with has_all_gather_into_tensor
* :recycle: remove deprecated _all_gather_base
* :recycle: remove deprecated _reduce_scatter_base
* :art: reformat files
* :wrench: fix _six
* Trigger CI
* Trigger CI
* Trigger CI
* :art: formatting
* incorporate suggestion
* incorporate suggestion
---------
Co-authored-by: Olatunji Ruwase <olruwase@microsoft.com>
Co-authored-by: Jeff Rasley <jerasley@microsoft.com>
