Arm backend: Move QuantArgs to its own file in _passes/

[Sebastian-Larsson]

The is part of an effort to reduce the number of functions/classes in utility files. This class has no reason being in a utility file when it has a clear purpose on its own.

cc @digantdesai @freddan80 @per @zingo @oscarandersson8218

[pytorch-bot]

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• ghstack-mergeability-check and Check labels failing with 'Resource not accessible by integration'

❌ 2 New Failures, 7 Pending, 3 Unrelated Failures

As of commit 8f10414 with merge base 13de356 ():

NEW FAILURES - The following jobs have failed:

• Build documentation / build (buck2) / Build doc (gh)
  At least one of the pre-conditions you specified did not hold
• pull / test-moshi-linux / linux-job (gh)
  RuntimeError: Command docker exec -t a38c5b9bba87f78ed09af9b57cac9f98c4a0cfe88f55218ae3467c471063bc17 /exec failed with exit code 1

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

• pull / test-custom-ops-linux / linux-job (gh) (matched linux rule in flaky-rules.json)
  The process '/usr/bin/git' failed with exit code 128
• pull / test-models-linux (add_mul, portable, linux.2xlarge) / linux-job (gh) (matched linux rule in flaky-rules.json)
  The process '/usr/bin/git' failed with exit code 128

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

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

• pull / test-openvino-linux / linux-job (gh) (trunk failure)
  AttributeError: '_OpNamespace' 'quantized_decomposed' object has no attribute 'convert_element_type'

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[Sebastian-Larsson]

Unrelated failing test. test-models-arm-zephyr is aborted for other jobs as well.