Prefix target_link_options_shared_lib with ExecuTorch

[swolchok]

I think we are getting build failures in the following PR (e.g., in QNN) because QNN has a copy/paste of this function that I changed to work differently. If this works out, we should namespace all our functions.

[swolchok]

Stack from ghstack (oldest at bottom):

• Use CMake EXPORT #8954
• -> Prefix target_link_options_shared_lib with ExecuTorch #12667
• append to CMAKE_PREFIX_PATH instead of setting executorch_DIR #12618
• [easy] Allow user to set ANDROID_NDK in build_llama_android script #12662
• Turn BUILD_TESTING off if EXECUTORCH_BUILD_TESTS is off #12566

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/12667

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❌ 3 New Failures

As of commit 0d164ce with merge base 4d7f9ca ():

NEW FAILURES - The following jobs have failed:

• pull / test-eval_llama-mmlu-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 6fbb9db245c4ad2afe7731fa8e0d30ca8ff891c1ec395cce3143eedd12497065 /exec failed with exit code 1
• pull / unittest / linux / linux-job (gh)
  RuntimeError: Command docker exec -t 4682b8277f96807eab6d15b9670ec37dd906fffbd8dc1357acde6a116980db11 /exec failed with exit code 1
• pull / unittest-editable / linux / linux-job (gh)
  RuntimeError: Command docker exec -t 54ca97c1dde16f77d546d48f06c87dcbf6a52b0d09d4de5e1ca882f4ab29e6eb /exec failed with exit code 1

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