Kill all running buck2 daemon before starting MacOS jobs

[huydhn]

I'm seeing lots of flaky buck2 showing up in trunk. I'm not sure if this help, but this should do no harm neither

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/7074

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❌ 1 Cancelled Job, 1 Unrelated Failure

As of commit 2f1c468 with merge base ec68eb3 ():

CANCELLED JOB - The following job was cancelled. Please retry:

• trunk / test-llama-runner-mac (bf16, portable) / macos-job (gh)
  ##[error]The operation was canceled.

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

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

• trunk / test-coreml-delegate / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 1

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