Support None as op input in GraphBuilder #11999

Job	Run time
build_docs (windows-latest)	3m 37s
update_readme	7s
build_docs (ubuntu-latest)	2m 55s
test (ubuntu-latest, py311)	11m 16s
test (ubuntu-latest, py311-onnx-ir-git)	11m 13s
test (windows-latest, py311-onnx-weekly)	9m 58s
test (macos-latest, py311-ort-nightly)	10m 59s
test (ubuntu-latest, py312)	11m 14s
test (macos-latest, py311)	1s
test (macos-latest, py311-onnx-ir-git)	1s
test (macos-latest, py310)	1s
test (macos-latest, py311-torch-nightly)	10m 59s
test (windows-latest, py311-torch-nightly)	10m 12s
test (ubuntu-latest, py311-ort-nightly)	11m 15s
test (windows-latest, py311-ort-nightly)	8m 50s
test (ubuntu-latest, py311-onnx-weekly)	11m 15s
test (macos-latest, py312)	1s
test (windows-latest, py311)	11m 3s
test (windows-latest, py311-onnx-ir-git)	11m 3s
test (windows-latest, py310)	9m 25s
test (macos-latest, py311-onnx-weekly)	1s
test (windows-latest, py312)	9m 19s
test (ubuntu-latest, py310)	11m 15s
test (ubuntu-latest, py311-torch-nightly)	11m 15s
	2h 57m 15s

Provide feedback