Arm backend: Generate runner-specific operator libs

[Erik-Lundell]

Previously, all cortex_m and quantized operators
were included, wasting binary space.

Implement a helper arm_runner_create_selected_ops_lib that makes it easy to create operator registration libs, for specific kernel libraries.

Use this in

• The arm example executor_runner
• The image_classification_ethos_u example
• The zephyr hello-executorch sample

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

[pytorch-bot]

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• [ALERT ONLY] - System Maintenance

❌ 1 Cancelled Job, 7 Unrelated Failures, 6 Unclassified Failures

As of commit 0aaf1a2 with merge base 2afdd93 ():

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• trunk / test-models-macos-coreml (ic4) / macos-job (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
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• trunk / test-models-macos-cpu (llama3_2_vision_encoder, portable) / macos-job (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
  ##[error]The operation was canceled.
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• pull / unittest-editable / linux / linux-job (gh)
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FLAKY - The following jobs failed but were likely due to flakiness present on trunk:

• pull / test-coreml-bc-macos (macos-m1-stable) / macos-job (gh) (similar failure)
• pull / test-qnn-testsuite-linux / test-backend-linux (qnn, models) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• trunk / test-models-macos-cpu (emformer_join, xnnpack-quantization-delegation) / macos-job (gh) (similar failure)
• trunk / test-models-macos-cpu (w2l, xnnpack-quantization-delegation) / macos-job (gh) (similar failure)

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

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

• pull / unittest / macos / macos-job (gh) (trunk failure)
• pull / unittest-buck / macos / macos-job (gh) (trunk failure)
• pull / unittest-editable / macos / macos-job (gh) (trunk failure)

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