Remove non-existent aten.transpose.Dimname overload from quantizer

[kirklandsign]

Summary:
The Arm quantizer's _one_to_one_shared_input_qspec set references
torch.ops.aten.transpose.Dimname at module load time. This named-tensor
overload no longer exists in the currently pinned torch version, so simply
importing quantization_annotator.py raises:

AttributeError: The underlying op of 'aten.transpose' has no overload name 'Dimname'

Because nearly every Arm test imports this module transitively
(test_pipeline -> arm_tester -> quantizer -> quantization_annotator), the
import error broke test listing/collection across the whole Arm backend test
suite (e.g. fbcode//executorch/backends/arm/test:decompose_int_pow_pass failed
at listing with 'collected 0 items / 1 error').

The .Dimname overload is for named tensors, which never appear in exported
edge-dialect graphs, so it is never matched in practice. Removing the line is
safe and restores all Arm tests.

Differential Revision: D107688878

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

[pytorch-bot]

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❌ 1 New Failure

As of commit 3a2c777 with merge base 5af1d7b ():

NEW FAILURE - The following job has failed:

• pull / test-multimodal-linux (gemma3-4b) / linux-job (gh)
  RuntimeError: Command docker exec -t cf9cb0287435d0b9b2e3e74ba88678cb5ab07a6a6803bc859a8c350404686a78 /exec failed with exit code 139

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[meta-codesync]

@kirklandsign has exported this pull request. If you are a Meta employee, you can view the originating Diff in D107688878.

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[Copilot]

Pull request overview

This PR fixes an import-time failure in the Arm quantizer by removing a reference to a no-longer-existent aten.transpose.Dimname overload, which was breaking Arm backend test discovery/collection.

Changes:

• Remove torch.ops.aten.transpose.Dimname from the Arm quantizer’s _one_to_one_shared_input_qspec op set to avoid AttributeError at module import time.

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[rascani]

Approving to unblock, but there's also a duplicate PR here:
#20074