Tensor.item should be disallowed in the CUDA Graphs region

[IvanYashchuk]

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🐛 Bug

import thunder
import torch

def func(x):
    return x.sum().item()

a = torch.randn(3, 3, device="cuda")

jfunc = thunder.jit(func)
jfunc(a) # works!

jfunc = thunder.jit(func, use_cudagraphs=True)
jfunc(a) # fails!

File thunder.CUDAGraph0_fn_3:10, in CUDAGraph0_fn(***failed resolving arguments***)
      9 del x
---> 10 f1 = Tensor.item(t0)  # f1: "float ?"
     11 del t0

RuntimeError: CUDA error: operation not permitted when stream is capturing

[tfogal]

related to #728