Arm backend: Add U55 operator check for cast

[oscarandersson8218]

U55 does not support casting from int32 or any cast involving booleans. This patch introduces a new U55 operator check that will reject any such casts. Note that bool->bool and int32->int32 are considered ok as these will not result in any cast operation.

cc @digantdesai @freddan80 @per @zingo

[pytorch-bot]

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❌ 5 New Failures, 4 Unrelated Failures

As of commit 2952c72 with merge base 25b3d63 ():

NEW FAILURES - The following jobs have failed:

• pull / test-qnn-wheel-packages-linux (3.10) / linux-job (gh)
  RuntimeError: Command docker exec -t 49fa79771c5b6dd5153f2cd9989e95fe5efb6ba686929c968387b40427a88789 /exec failed with exit code 1
• pull / test-qnn-wheel-packages-linux (3.11) / linux-job (gh)
  RuntimeError: Command docker exec -t ef0fb2a0cc39c3392379fc4ce1905adf2c53063f2f7481337df9bec8ca45e617 /exec failed with exit code 1
• pull / test-qnn-wheel-packages-linux (3.12) / linux-job (gh)
  RuntimeError: Command docker exec -t fb7a614b91c7af35398ab6cd2c26da0b6b050afdec2f62cc73b32db817f4d43c /exec failed with exit code 1
• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 6fb6a49fb3d087fcf753aa424633bba8b426cbcef42deacf459616474335f89d /exec failed with exit code 1
• pull / unittest-editable / macos / macos-job (gh)
  export/tests/test_target_recipes.py::TestTargetRecipes::test_mv3_model

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

• pull / test-setup-linux-gcc / linux-job (gh) (similar failure)
  ##[error]The operation was canceled.
• pull / unittest / macos / macos-job (gh) (similar failure)
  exir/tests/test_quant_fusion_pass.py::TestQuantFusionPass::test_embedding_torchao

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

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

• pull / test-binary-size-linux-gcc / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• trunk / unittest-release / macos / macos-job (gh) (trunk failure)
  exir/tests/test_quant_fusion_pass.py::TestQuantFusionPass::test_embedding_torchao

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[zingo]

@digantdesai would this be OK to merge?

[digantdesai]

Seems low risk for internal 🤞