Arm backend: Share data layout dtype validation

[Sebastian-Larsson]

cc @digantdesai @freddan80 @per @zingo @oscarandersson8218 @mansnils @robell @rascani

[pytorch-bot]

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❗ 1 Active SEVs

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• B200 dgxb200-03 in bad state

❌ 2 New Failures, 4 Unrelated Failures

As of commit 12605cb with merge base 4798a67 ():

NEW FAILURES - The following jobs have failed:

• trunk / test-custom-ops-macos (cmake) / macos-job (gh)
  torchaudio
• trunk / test-qnn-model (fp32, ic4) / linux-job (gh)
  RuntimeError: Command bash /__w/_temp/exec_script failed with exit code 1

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• trunk / unittest-release / macos / macos-job (gh) (similar failure)
  [ FAILED ] ParallelTestWithOrWithoutThreadpool/ParallelTest.NestedCallsPreserveOuterThreadNumber/1, where GetParam() = false

BROKEN TRUNK - The following jobs failed but was present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• trunk / test-samsung-models-linux / linux-job (gh) (trunk failure)
  test_mobilebert_qat_a8w8
• trunk / unittest-release / linux / linux-job (gh) (trunk failure)
  [ FAILED ] ParallelTestWithOrWithoutThreadpool/ParallelTest.NestedCallsPreserveOuterThreadNumber/1, where GetParam() = false
• trunk / unittest-release / windows / windows-job (gh) (trunk failure)
  [ FAILED ] ParallelTestWithOrWithoutThreadpool/ParallelTest.NestedCallsPreserveOuterThreadNumber/1, where GetParam() = false

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