Revert #3979: Checker should validate the node's inputs/outputs have names when Variadic #4283
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Description
Revert #3979: Checker should validate the node's inputs/outputs have names when Variadic
Motivation and Context
It seems possible that some operators set Variadic for some dynamic situations. For instance, PythonOpGrad from ORT might have an empty input for Variadic input. To unblock the failure right before the release, loosen the onnx.checker for now. Going forward, we should consider to make the check only for Loop op. Reopen issue #3969 for future tracking.