[ONNX] Enable test_uninitialized_optional (#83183)
Why:
Now that onnxruntime supports optional tensor execution, we should enable its tests on runtime.
CI should pass after ONNXRUNTIME bumps to 1.12.0 #81147
Pull Request resolved: https://github.com/pytorch/pytorch/pull/83183
Approved by: https://github.com/BowenBao
