Revert "[Dynamo] Remove deadcode: unwrapping script_if_tracing (#120444)"
This reverts commit 4d2073bc3faa7f2014c4fb2f568e68fe195b6f99.
Reverted https://github.com/pytorch/pytorch/pull/120444 on behalf of https://github.com/kit1980 due to breaking internal builds, see D54192376 ([comment](https://github.com/pytorch/pytorch/pull/120444#issuecomment-1965600268))
