Deprecate torch._utils.is_compiling() and `torch._dynamo.external_u…

[frances720]

…tils.is_compiling()` (pytorch#127690)

This PR is split from PR pytorch#126898.

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

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Pull Request resolved: pytorch#127690
Approved by: https://github.com/Skylion007, https://github.com/malfet

Fixes #ISSUE_NUMBER

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