Modify AAR existence check to skip build

[kirklandsign]

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[pytorch-bot]

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❌ 10 New Failures

As of commit dfaf761 with merge base 7492d0d ():

NEW FAILURES - The following jobs have failed:

• pull / test-llama_runner_eager-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 6dc5f9312cbba92e6ea5dc8782c52eeb1f40960e12a56048dc9650f6cb3c2354 /exec failed with exit code 8
• pull / test-multimodal-linux (gemma3-4b) / linux-job (gh)
  RuntimeError: Command docker exec -t 04ff0e4071589629c302d6b17ec074a182db73562e992faaa1a10332aff854a7 /exec failed with exit code 1
• pull / test-samsung-quantmodels-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 8fd3f0485c3ecd741dceb9abea05aea5f2d48f82f384db89f95af07dc43b453a /exec failed with exit code 1
• Test CUDA Builds / test-model-cuda-e2e (mistralai, Voxtral-Mini-3B-2507, quantized-int4-tile-packed) / linux-job (gh)
  RuntimeError: Command docker exec -t e329f106bdd99f552716408857e707140c3aa84f6b7d9fd4f6aed4f8c4d9cc15 /exec failed with exit code 1
• Test CUDA Builds / test-model-cuda-e2e (openai, whisper-large-v3-turbo, non-quantized) / linux-job (gh)
  RuntimeError: Command docker exec -t f74e395c0961b81422c9e556f74ebaf652e3257eba43ce43b3d205ec777f95f0 /exec failed with exit code 1
• Test CUDA Builds / test-model-cuda-e2e (openai, whisper-large-v3-turbo, quantized-int4-tile-packed) / linux-job (gh)
  RuntimeError: Command docker exec -t 7f90650b3246673b3bd0971b158c5b658781356ca2876425440ffe8ae8ef783c /exec failed with exit code 1
• Test CUDA Builds / test-model-cuda-e2e (openai, whisper-large-v3-turbo, quantized-int4-weight-only) / linux-job (gh)
  RuntimeError: Command docker exec -t c884824112ccd994153ab68478cbae0ad64f9527646f4ba48acf38d862ba81d2 /exec failed with exit code 1
• Test CUDA Builds / test-model-cuda-e2e (openai, whisper-small, non-quantized) / linux-job (gh)
  RuntimeError: Command docker exec -t 8daacbac5ba99134a63f3e780202d98e6b01dbd85d3f6893a8bbcfbe8407271b /exec failed with exit code 1
• Test CUDA Builds / test-model-cuda-e2e (openai, whisper-small, quantized-int4-tile-packed) / linux-job (gh)
  RuntimeError: Command docker exec -t 1fa812c5e1a7b80d8698f227c4333c677900f9cfd4852cc1b4e96c51783c74bf /exec failed with exit code 1
• Test CUDA Builds / test-model-cuda-e2e (openai, whisper-small, quantized-int4-weight-only) / linux-job (gh)
  RuntimeError: Command docker exec -t cc91b0ccf97690754a5606b69a12d1328b4a260c676f9a6cdfa234dede9f21b9 /exec failed with exit code 1

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