Revert "[C10D] Implement new libuv backend for TCPStore. (#105870)"
This reverts commit 3c841163cef9167ea50adbcfc4384b63c0b6e93a.
Reverted https://github.com/pytorch/pytorch/pull/105870 on behalf of https://github.com/huydhn due to I think the distributed failure is related as this is now failing in trunk ([comment](https://github.com/pytorch/pytorch/pull/105870#issuecomment-1683117192))
