Remove ProcessGroup from TensorPipeAgent initialization (#66708)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/66708
cc pietern mrshenli pritamdamania87 zhaojuanmao satgera rohan-varma gqchen aazzolini osalpekar jiayisuse SciPioneer H-Huang
Test Plan: Imported from OSS
Reviewed By: anjali411
Differential Revision: D31762735
Pulled By: H-Huang
fbshipit-source-id: 9f3879fca6b8258f7e6171b14d2c1d6cce21627d
