Re-apply U55 reject split for bool permute test

[psiddh]

Summary:
Forward fix on top of D103817917 (Arm backend: Cleanup dim-order and permute handling — DiffTrain import of upstream PR #19278).

D103817917 reverted an internally-applied test split: the bool
permute case (rank2_bool) is U55-rejected and was already moved
out of the U55-delegating test on master into a separate
test_data_suite_u55_reject set with a dedicated
test_permute_u55_INT_not_delegated test using
OpNotSupportedPipeline. Upstream PR #19278 doesn't include that
split, so the DiffTrain import wipes it out and brings back the
combined test_data_suite + special-cased bool branch in
test_permute_u55_INT. That regresses CI:
test_permute_u55_INT[rank2_bool] is reported as a critical
LAND_BLOCKING failure on D103817917.

Re-apply the split so trunk returns to the clean form after
D103817917 lands:

• Add OpNotSupportedPipeline import.
• Move rank2_bool out of test_data_suite into a new
  test_data_suite_u55_reject dict.
• Drop the dead if test_data[0].dtype == torch.bool: ...
  workaround block from test_permute_u55_INT (no bool flows
  through this test anymore).
• Add test_permute_u55_INT_not_delegated parametrized over
  test_data_suite_u55_reject, exercising
  OpNotSupportedPipeline with u55_subset=True.

The test_data_suite_u55 dict introduced by D103817917 (large
permutes that only U55 needs to exercise) is preserved unchanged.

Differential Revision: D103963260

cc @digantdesai @freddan80 @per @zingo @oscarandersson8218 @mansnils @Sebastian-Larsson @robell

[pytorch-bot]

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❌ 1 New Failure, 30 Pending, 1 Unrelated Failure

As of commit 9dda9f6 with merge base 5faf36e ():

NEW FAILURE - The following job has failed:

• pull / android / run-emulator (gh)
  The process '/usr/bin/sh' failed with exit code 1

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

• pull / test-lora-multimethod-linux / linux-job (gh) (matched linux rule in flaky-rules.json)
  The runner has received a shutdown signal. This can happen when the runner service is stopped, or a manually started runner is canceled.

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[meta-codesync]

@psiddh has exported this pull request. If you are a Meta employee, you can view the originating Diff in D103963260.

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[Copilot]

Pull request overview

Re-applies the previously existing U55 reject split for the bool permute test case in Arm backend op tests, restoring CI stability after a prior import/cleanup reverted the split.

Changes:

• Import OpNotSupportedPipeline for non-delegation validation.
• Move the rank2_bool permute case out of the U55-delegating suite into a dedicated test_data_suite_u55_reject.
• Remove the bool-specific workaround in test_permute_u55_INT and add test_permute_u55_INT_not_delegated to assert the op is not delegated on U55.

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