Arm backend: Import executorch deps using find_package

[AdrianLundell]

• Renames portable_ops_lib to arm_portable_ops_lib to not conflict with the op_lib from the executorch_package regestring all ops.
• Adds install target to the ethos_u_delegate to make it findable using find_package.
• Removes the --whole-archive arg for quantized_ops_lib to avoid re-registiring runtime error.

cc @digantdesai @freddan80 @per @zingo @oscarandersson8218

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/13060

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❌ 4 New Failures, 1 Unrelated Failure

As of commit 5b1e5e7 with merge base f8b4835 ():

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 / android / run-emulator (gh)
  The process '/usr/bin/sh' failed with exit code 255
• pull / test-moshi-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 379fb7fb715fe836efa30ae83439dae9d9618eba1e98f7ce7c1e595e875630bb /exec failed with exit code 1
• trunk / test-arm-cortex-m-size-test (bare_metal) / linux-job (gh)
  RuntimeError: Command docker exec -t 47def5af8f994ff5d9c2ae2a701e8973a9e4fcf2e64f4736398912ad409374b0 /exec failed with exit code 1

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 CI failures. Approved