Fix mutable buffer tagging in ExecuTorch

[metascroy]

This PR is intended to address #11542. A mutable buffer is tagged for consumption by the delegate, but the graph_signature.output_spec keeps the mutable buffer there because it is not in the state_dict (persistent=false), but instead inside of constants.

[pytorch-bot]

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[JacobSzwejbka]

@SS-JIA Is this the issue you were asking me about today?

[metascroy]

@angelayi can you take a look before I merge?

[metascroy]

@angelayi can you take a look before I merge?

I'll merge now to make the branch cut since @JacobSzwejbka approved, but have a look when you get a chance.