[fx] Make NormalizeArgs preserve node type (#85637)
Summary: Make `NormalizeArgs` preserve node types when transforming the graph. This bug is preventing me from scripting a graph that goes through the fx2trt `acc_tracer`.
Test Plan: New unit test
Reviewed By: ipiszy
Differential Revision: D39753021
Pull Request resolved: https://github.com/pytorch/pytorch/pull/85637
Approved by: https://github.com/Chillee
