[jit] Renamed prim::Concat as prim::VarConcat (#61498)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/61498
Test Plan: Imported from OSS
Reviewed By: eellison
Differential Revision: D29647586
Pulled By: navahgar
fbshipit-source-id: cdd34ea5a3c986350a813be17e7d428844ea4cbf
