Change is_variable() to check existence of AutogradMeta, and remove is_variable_ #19139
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Currently, a TensorImpl's
is_variable_is true if and only if the TensorImpl has AutogradMeta. This PR unifies these two concepts by removingis_variable_and changeis_variable()to check existence of AutogradMeta instead.Removing
is_variable_is part of the work in Variable/Tensor merge. After the merge, allat::Tensors are variables, andTensor.is_variable()will always return true.