Remove torch strict symbolic shape setup passes.

[stellaraccident]

As of https://github.com/llvm/torch-mlir/pull/3319, upstream now sets the strict attribute on functions produced via fx/dynamo, so we don't have to do it locally. The following can be removed (and all impl/support): https://github.com/iree-org/iree/blob/main/compiler/plugins/input/Torch/InputConversion/Passes.cpp#L40

To account for any IR in the wild, maybe plan to drop this in ~July 2024.