[fx] Have replace_pattern return replaced nodes (#90244)
Summary: Modified replace_pattern in the subgraph rewriter to return a list of pairs of matches along with their corresponding replacement nodes in the modified graph (`List[Tuple[Match, List[Node]]]`). This allows us to easily modify the replaced nodes, including setting the metadata.
Test Plan: CI
Differential Revision: D41737056
Pull Request resolved: https://github.com/pytorch/pytorch/pull/90244
Approved by: https://github.com/SherlockNoMad
