Arm backend: Add DecomposeLinalgVectorNorm pass + tests

[wwwind]

Added decomposition of linalg vector norm.

Change-Id: I4d76df79aaf7b14f6f82bd989e6d78a6e2326669

cc @digantdesai @freddan80 @per @zingo @oscarandersson8218

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/10848

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❌ 1 New Failure, 1 Cancelled Job, 1 Unrelated Failure

As of commit cd68529 with merge base c913634 ():

NEW FAILURE - The following job has failed:

• Lint / lintrunner / linux-job (gh)
  >>> Lint for examples/models/llama/export_llama_lib.py:

CANCELLED JOB - The following job was cancelled. Please retry:

• trunk / test-custom-ops-macos (cmake) / macos-job (gh)
  ##[error]The operation was canceled.

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-llava-runner-linux / linux-job (gh) (trunk failure)
  test_llava_export

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[zingo]

I rebased this as we just merged a big PR to make sure it's tested with latest.

[zingo]

fails unrelated