Fix estimate_nccl_collective_runtime (#118986)
`estimate_nccl_collective_runtime` has been broken and the errors have been silently swallowed by inductor. This PR:
- Fixes the issues described in https://github.com/pytorch/pytorch/issues/118497.
- Adds white-box testing so future issues can be surfaced in tests.
- Add support for native funcol IRs.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/118986
Approved by: https://github.com/yf225
ghstack dependencies: #118910, #118911, #118437
