Arm backend: Add pass to create CONST_SHAPEs

[oscarandersson8218]

Add pass that creates CONST_SHAPEs for view_copy and repeat based on their list arguments.

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

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/18099

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❌ 1 New Failure, 4 Cancelled Jobs, 1 Unrelated Failure

As of commit 42926f1 with merge base 66b5448 ():

NEW FAILURE - The following job has failed:

• trunk / unittest-release / macos / macos-job (gh)
  backends/xnnpack/test/ops/test_conv2d.py::TestConv2d::test_fp16_conv2d

CANCELLED JOBS - The following jobs were cancelled. Please retry:

• periodic (gh)
• pull / unittest-buck / macos / macos-job (gh)
  ##[error]The operation was canceled.
• trunk / test-mcu-cortex-m-backend / linux-job (gh)
• trunk / test-models-macos-coreml (mobilebert) / macos-job (gh)
  ##[error]The operation was canceled.

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

• trunk / test-huggingface-transformers-xnnpack (qwen3-0.6b|xnnpack|--quantize) / linux-job (gh) (matched linux rule in flaky-rules.json)
  The process '/usr/bin/git' failed with exit code 128

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