Revert "Deprecate torch._utils.is_compiling() and torch._dynamo.external_utils.is_compiling() (#127690)"

[atalman]

Revert of #127690
Reverted on Main

[pytorch-bot]

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❌ 1 Cancelled Job, 3 Unrelated Failures

As of commit 1095f7c with merge base b66e3f0 ():

CANCELLED JOB - The following job was cancelled. Please retry:

• Check Labels (gh)

FLAKY - The following jobs failed but were likely due to flakiness present on trunk:

• Nightly Upload to rockset / upload-stats-to-rockset (gh) (detected as infra flaky with no runner)
• pull / linux-focal-py3_8-clang9-xla / test (xla, 1, 1, linux.12xlarge) (gh) (similar failure)
  test_repeat_truncated
• Upload Alerts to AWS/Rockset / upload-alerts (gh) (detected as infra flaky with no runner)

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