DTensor + dynamo: fix is_shard/replicate always inlining to False (#118668)
Fixes an internal enablement bug. When dynamo traces `is_sharded`/`is_replicate`, it would unconditioanlly assume the result was False.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/118668
Approved by: https://github.com/wconstab, https://github.com/wanchaol
ghstack dependencies: #117667, #117666, #118209, #118191, #118667
