Revert "Moving CommTensor from tests to private _spmd folder (#84655)"
This reverts commit 07dad15583a1a6bb6a65594883fa094a3b109baf.
Reverted https://github.com/pytorch/pytorch/pull/84655 on behalf of https://github.com/kit1980 due to Several test failures on trunk https://hud.pytorch.org/pytorch/pytorch/commit/07dad15583a1a6bb6a65594883fa094a3b109baf, PR also had failures
