lintrunner init can fail, don't suppress stderr

[swolchok]

Seeing it fail currently on https://github.com/pytorch/executorch/actions/runs/15647163870/job/44086495890?pr=11664 and cannot debug; let's not have this happen again.

[swolchok]

Stack from ghstack (oldest at bottom):

• -> lintrunner init can fail, don't suppress stderr #11667

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/11667

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❌ 1 New Failure

As of commit c0356df with merge base 8cfa858 ():

NEW FAILURE - The following job has failed:

• Lint / lintrunner / linux-job (gh)
  RuntimeError: Command docker exec -t 73f4380c81564f7fe123f22bbe9c9fc076a375d69762796c20da3193441d9a7d /exec failed with exit code 127

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