Change torch.autograd.graph.disable_saved_tensors_hooks to be public API

[zou3519]

Stack from ghstack:

• -> Change torch.autograd.graph.disable_saved_tensors_hooks to be public API #85994
• Disallow saved tensor hooks in functorch transforms #85972
• Add mechanism to disable the "saved tensors hooks" feature #85971

Also addresses some comments from the review in
#85971

[pytorch-bot]

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[albanD]

Thanks!

[soulitzer]

Cool!

[zou3519]

@pytorchbot merge

[pytorchmergebot]

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