Rename build files from TARGETS to BUCK (group ID: -4448153625730741820)

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Reviewed By: bigfootjon

Differential Revision: D91838147

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🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/17042

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❗ 1 Active SEVs

There are 1 currently active SEVs. If your PR is affected, please view them below:

• Github Runners Incident: PR merge is delayed, CI jobs are cancelled and skipped

❌ 2 New Failures, 1 Unrelated Failure

As of commit a098cef with merge base 6e5fafa ():

NEW FAILURES - The following jobs have failed:

• pull / unittest-buck / linux / linux-job (gh)
  RuntimeError: Command docker exec -t 9d6b187ea9bceda4f1d2da00bc61ff38643cc37809fa86b213c51dc8fe3c414d /exec failed with exit code 3
• Test CUDA Builds / test-model-cuda-e2e (mistralai, Voxtral-Mini-3B-2507, quantized-int4-tile-packed) / linux-job (gh)
  RuntimeError: Command docker exec -t 171ed8cb9ddaeea7492b1b73576cdbca4eaa339ffeef384e1e53d5a3a1f37ce8 /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 / unittest-buck / macos / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 3

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