Deprecate torch._utils.is_compiling() and torch._dynamo.external_utils.is_compiling()

[XuehaiPan]

This PR is split from PR #126898.

• [BE] wrap deprecated function/class with typing_extensions.deprecated #126898

---

Stack from ghstack (oldest at bottom):

• -> Deprecate torch._utils.is_compiling() and torch._dynamo.external_utils.is_compiling() #127690

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[pytorch-bot]

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[XuehaiPan]

@pytorchbot rebase

[pytorchmergebot]

@pytorchbot started a rebase job onto refs/remotes/origin/viable/strict. Check the current status here

[XuehaiPan]

@pytorchbot merge

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[kit1980]

@pytorchbot revert -m "breaking internal builds" -c ghfirst

Apparently torch._dynamo.is_compiling() is used internally at Meta
cc @PaliC

[pytorchmergebot]

@pytorchbot successfully started a revert job. Check the current status here.
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[pytorchmergebot]

@XuehaiPan your PR has been successfully reverted.

[kit1980]

Apparently torch._dynamo.is_compiling() is used internally at Meta

Or maybe the actual issue shows in JIT-compiled user code:

RuntimeError: 
undefined value torch:
return torch.compiler.is_compiling()
           ~~~~~ <--- HERE